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transmitter in Australia. In the years 2019 and 2020, two solar eclipses crossed the NWC\u2013Suizhou path at different locations. Each solar eclipse event represents a naturally occurring controlled experiment, but these two events are unique in that similar levels of electron density variation occurred at different locations along the VLF propagation path. Therefore, we conducted a comparative study using the VLF measurements during these two eclipses. Previous studies mostly estimated a pair of the reflection height (h\u2032) and sharpness parameter (\u03b2) using the Long Wavelength Propagation Capability code, whereas, in this study, we use the VLF amplitude and phase as constraints in order to find the electron density change that best explains the VLF measurements. The eclipse measurements could be best explained if the path-averaged \u03b2 value was 0.56 and 0.62 km\u22121 for the 2019 and 2020 eclipse, respectively. The VLF reflection height increased from 71.5 to 73.3 km for the 2019 eclipse and from 71.1 to 72.8 km for the 2020 eclipse. The best-fit \u03b2 values were consistent with the Faraday International Reference Ionosphere model and statistical studies, and the h\u2032 change was also consistent with previous studies and theoretical calculations. Moreover, present results suggested that VLF signals collected by a single receiver were not sensitive to where the electron density change occurs along the propagation path but reflected the average path condition. Therefore, a network of VLF receivers is required in order to monitor in real time the spatial extent of the space weather events that disturb the lower ionosphere.<\/jats:p>","DOI":"10.3390\/rs15123025","type":"journal-article","created":{"date-parts":[[2023,6,9]],"date-time":"2023-06-09T08:37:33Z","timestamp":1686299853000},"page":"3025","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["A Comparative Study of VLF Transmitter Signal Measurements and Simulations during Two Solar Eclipse Events"],"prefix":"10.3390","volume":"15","author":[{"given":"Wen","family":"Cheng","sequence":"first","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0092-824X","authenticated-orcid":false,"given":"Wei","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"},{"name":"Hubei Luojia Laboratory, Wuhan 430072, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3078-9562","authenticated-orcid":false,"given":"Xudong","family":"Gu","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"},{"name":"Hubei Luojia Laboratory, Wuhan 430072, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0336-3849","authenticated-orcid":false,"given":"Shiwei","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]},{"given":"Qingshan","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]},{"given":"Binbin","family":"Ni","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"},{"name":"Hubei Luojia Laboratory, Wuhan 430072, China"}]},{"given":"Zilong","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]},{"given":"Binxiao","family":"Xiao","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]},{"given":"Xiaoyu","family":"Meng","sequence":"additional","affiliation":[{"name":"Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Brasseur, G.P., and Solomon, S. (2006). Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere, Springer. [3rd ed.].","DOI":"10.1007\/1-4020-3824-0"},{"key":"ref_2","unstructured":"Budden, K.G. (2009). Radio Waves in the Ionosphere, Cambridge University Press."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"19977","DOI":"10.1029\/97JA01728","article-title":"Medium Energy Particle Precipitation Influences on the Mesosphere and Lower Thermosphere","volume":"102","author":"Codrescu","year":"1997","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"A00E36","DOI":"10.1029\/2009JA014775","article-title":"A Survey of ELF and VLF Research on Lightning-Ionosphere Interactions and Causative Discharges","volume":"115","author":"Inan","year":"2010","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"SIA 10-1","DOI":"10.1029\/2001JA000301","article-title":"Determining the Size of Lightning-Induced Electron Precipitation Patches","volume":"107","author":"Clilverd","year":"2002","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"e2020JA028482","DOI":"10.1029\/2020JA028482","article-title":"A Generalized Method for Calculating Atmospheric Ionization by Energetic Electron Precipitation","volume":"125","author":"Xu","year":"2020","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"418","DOI":"10.1038\/331418a0","article-title":"Observation of an Ionospheric Disturbance Caused by a Gamma-Ray Burst","volume":"331","author":"Fishman","year":"1988","journal-title":"Nature"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1729","DOI":"10.1016\/S1364-6826(01)00048-7","article-title":"Solar Flare Induced Ionospheric D-Region Enhancements from VLF Amplitude Observations","volume":"63","author":"Thomson","year":"2001","journal-title":"J. Atmos. Sol.-Terr. Phys."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"705","DOI":"10.1029\/91GL00364","article-title":"Heating and Ionization of the Lower Ionosphere by Lightning","volume":"18","author":"Inan","year":"1991","journal-title":"Geophys. Res. Lett."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1029\/2000GL011951","article-title":"Lower Ionospheric Modification by Lightning-EMP: Simulation of the Night Ionosphere over the United States","volume":"28","author":"Rodger","year":"2001","journal-title":"Geophys. Res. Lett."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1029\/2018GL081391","article-title":"Remote Sensing of Radiation Belt Energetic Electrons Using Lightning Triggered Upper Band Chorus","volume":"46","author":"Hosseini","year":"2019","journal-title":"Geophys. Res. Lett."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"e2021JD034914","DOI":"10.1029\/2021JD034914","article-title":"Chemical Response of the Upper Atmosphere Due to Lightning-Induced Electron Precipitation","volume":"126","author":"Xu","year":"2021","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1003","DOI":"10.1029\/2001RG000106","article-title":"Gravity Wave Dynamics and Effects in the Middle Atmosphere","volume":"41","author":"Fritts","year":"2003","journal-title":"Rev. Geophys."},{"key":"ref_14","first-page":"A02204","article-title":"Temporal Signatures of Radiation Belt Electron Precipitation Induced by Lightning-Generated MR Whistler Waves: 2","volume":"111","author":"Bortnick","year":"2006","journal-title":"Global Signatures. J. Geophys. Res. Space Phys."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1167","DOI":"10.1002\/2017GL076510","article-title":"On the Effects of Bremsstrahlung Radiation During Energetic Electron Precipitation","volume":"45","author":"Xu","year":"2018","journal-title":"Geophys. Res. Lett."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"391","DOI":"10.1007\/s11430-021-9850-7","article-title":"Artificial Modification of Earth\u2019s Radiation Belts by Ground-Based Very-Low-Frequency (VLF) Transmitters","volume":"65","author":"Ni","year":"2022","journal-title":"Sci. China Earth Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"4847","DOI":"10.1038\/s41467-020-18545-y","article-title":"Very-Low-Frequency Transmitters Bifurcate Energetic Electron Belt in near-Earth Space","volume":"11","author":"Hua","year":"2020","journal-title":"Nat. Common."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"7613","DOI":"10.1109\/TGRS.2019.2914920","article-title":"VLF Measurements and Modeling of the D-Region Response to the 2017 Total Solar Eclipse","volume":"57","author":"Xu","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"A10314","DOI":"10.1029\/2010JA015715","article-title":"Midlatitude Daytime D Region Ionosphere Variations Measured from Radio Atmospherics","volume":"115","author":"Han","year":"2010","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1689","DOI":"10.1016\/S1364-6826(00)00121-8","article-title":"ELF and VLF Radio Waves","volume":"62","author":"Barr","year":"2000","journal-title":"J. Atmos. Sol.-Terr. Phys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1109\/74.683540","article-title":"Measurements of the VLF Scattering Pattern of the Structured Plasma of Red Sprites","volume":"40","author":"Hardman","year":"1998","journal-title":"IEEE Antennas Propag. Mag."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1781","DOI":"10.1029\/98RS02381","article-title":"Ionospheric D Region Remote Sensing Using VLF Radio Atmospherics","volume":"33","author":"Cummer","year":"1998","journal-title":"Radio Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"D24109","DOI":"10.1029\/2005JD006987","article-title":"Terrestrial Gamma Ray Flashes Observed Aboard the Compton Gamma Ray Observatory\/Burst and Transient Source Experiment and ELF\/VLF Radio Atmospherics","volume":"111","author":"Cohen","year":"2006","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1109\/TGRS.2009.2028334","article-title":"Sensitive Broadband ELF\/VLF Radio Reception with the AWESOME Instrument","volume":"48","author":"Cohen","year":"2010","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"e2021SW002820","DOI":"10.1029\/2021SW002820","article-title":"Solar Flare X-Ray Impacts on Long Sub ionospheric VLF Paths","volume":"19","author":"Belcher","year":"2021","journal-title":"Space Weather"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1127","DOI":"10.1038\/2261127a0","article-title":"VLF Propagation Effects Produced by the Eclipse","volume":"226","author":"Schaal","year":"1970","journal-title":"Nature"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"226","DOI":"10.1016\/0021-9169(52)90033-0","article-title":"Theory of Formation of an Ionospheric Layer below E Layer Based on Eclipse and Solar Flare Effects at 16 Kc\/Sec","volume":"2","author":"Bracewell","year":"1952","journal-title":"J. Atmos. Terr. Phys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1309","DOI":"10.1016\/0021-9169(81)90156-2","article-title":"The Total Solar Eclipse of 23 October 1976 Observed at VLF","volume":"43","author":"Lynn","year":"1981","journal-title":"J. Atmos. Terr. Phys."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"10073","DOI":"10.1029\/JA086iA12p10073","article-title":"Modeling the Ion Chemistry of the D Region: A Case Study Based upon the 1966 Total Solar Eclipse","volume":"86","author":"Sears","year":"1981","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"773","DOI":"10.1029\/2000RS002395","article-title":"Total Solar Eclipse Effects on VLF Signals: Observations and Modeling","volume":"36","author":"Clilverd","year":"2001","journal-title":"Radio Sci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"5930","DOI":"10.1002\/2016JA022695","article-title":"Changes in the D Region Associated with Three Recent Solar Eclipses in the South Pacific Region","volume":"121","author":"Kumar","year":"2016","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"A10301","DOI":"10.1029\/2011JA016641","article-title":"D-Region Ionosphere Response to the Total Solar Eclipse of 22 July 2009 Deduced from ELF-VLF Tweek Observations in the Indian Sector","volume":"116","author":"Singh","year":"2011","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"196","DOI":"10.1016\/j.asr.2012.04.007","article-title":"Modeling of Sub-Ionospheric VLF Signal Perturbations Associated with Total Solar Eclipse, 2009 in Indian Subcontinent","volume":"50","author":"Pal","year":"2012","journal-title":"Adv. Space Res."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"3348","DOI":"10.1002\/2018GL077351","article-title":"The Lower Ionospheric VLF\/LF Response to the 2017 Great American Solar Eclipse Observed Across the Continent","volume":"45","author":"Cohen","year":"2018","journal-title":"Geophys. Res. Lett."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"254","DOI":"10.1016\/j.asr.2021.11.007","article-title":"Effect of 21 June 2020 Solar Eclipse on the Ionosphere Using VLF and GPS Observations and Modeling","volume":"69","author":"Tripathi","year":"2022","journal-title":"Adv. Space Res."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1871","DOI":"10.1016\/j.asr.2016.01.023","article-title":"Development of Ground-Based ELF\/VLF Receiver System in Wuhan and Its First Results","volume":"57","author":"Chen","year":"2016","journal-title":"Adv. Space Res."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"166","DOI":"10.1007\/s11431-016-6103-5","article-title":"First Observations of Low Latitude Whistlers Using WHU ELF\/VLF Receiver System","volume":"60","author":"Chen","year":"2017","journal-title":"Sci. China Technol. Sci."},{"key":"ref_38","first-page":"4300","article-title":"Observations and analyses of the sunrise effect for NWC VLF transmitter signals","volume":"63","author":"Wang","year":"2020","journal-title":"Chin. J. Geophys."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"e2020JA029101","DOI":"10.1029\/2020JA029101","article-title":"Statistical Analysis of Very Low Frequency Atmospheric Noise Caused by the Global Lightning Using Ground-Based Observations in China","volume":"126","author":"Gu","year":"2021","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_40","first-page":"238","article-title":"A Detailed Investigation of Low Latitude Tweek Atmospherics Observed by the WHU ELF\/VLF Receiver: 2","volume":"4","author":"Yi","year":"2020","journal-title":"Occurrence Features and Associated Ionospheric Parameters. Earth Planet. Phys."},{"key":"ref_41","first-page":"120","article-title":"A Detailed Investigation of Low Latitude Tweek Atmospherics Observed by the WHU ELF\/VLF Receiver: I","volume":"4","author":"Zhou","year":"2020","journal-title":"Automatic Detection and Analysis Method. Earth Planet. Phys."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"e2022JA030784","DOI":"10.1029\/2022JA030784","article-title":"First Results of the Wave Measurements by the WHU VLF Wave Detection System at the Chinese Great Wall Station in Antarctica","volume":"127","author":"Gu","year":"2022","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1109\/MCOM.1979.1089999","article-title":"Minimum Shift Keying: A Spectrally Efficient Modulation","volume":"17","author":"Pasupathy","year":"1979","journal-title":"IEEE Commun. Mag."},{"key":"ref_44","unstructured":"Paschal, E.W. (1988). Phase Measurements of Very-Low-Frequency Signals from the Magnetosphere, Stanford University."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"901","DOI":"10.1002\/2017JA024907","article-title":"Polarization of Narrowband VLF Transmitter Signals as an Ionospheric Diagnostic","volume":"123","author":"Gross","year":"2018","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"651","DOI":"10.1016\/j.asr.2018.05.006","article-title":"Modeling D-Region Ionospheric Response of the Great American TSE of August 21, 2017 from VLF Signal Perturbation","volume":"62","author":"Chakrabarti","year":"2018","journal-title":"Adv. Space Res."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/0021-9169(93)90122-F","article-title":"Experimental Daytime VLF Ionospheric Parameters","volume":"55","author":"Thomson","year":"1993","journal-title":"J. Atmos. Terr. Phys."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"A07304","DOI":"10.1029\/2007JA012271","article-title":"Nighttime Ionospheric D Region Parameters from VLF Phase and Amplitude","volume":"112","author":"Thomson","year":"2007","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1016\/S1364-6826(00)00027-4","article-title":"VLF Phase and Amplitude: Daytime Ionospheric Parameters","volume":"62","author":"McCrae","year":"2000","journal-title":"J. Atmos. Sol.-Terr. Phys."},{"key":"ref_50","doi-asserted-by":"crossref","unstructured":"Wait, J.R. (1964). Characteristics of the Earth-Ionosphere Waveguide for VLF Radio Waves.","DOI":"10.6028\/NBS.TN.300"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"e2021JA029288","DOI":"10.1029\/2021JA029288","article-title":"An Electron Density Model of the D- and E-Region Ionosphere for Trans ionospheric VLF Propagation","volume":"126","author":"Xu","year":"2021","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"e2020JA028540","DOI":"10.1029\/2020JA028540","article-title":"Quantification of Ionospheric Perturbations from Lightning Using Overlapping Paths of VLF Signal Propagation","volume":"126","author":"Renick","year":"2021","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"A03316","DOI":"10.1029\/2011JA017408","article-title":"An Improved Model of the Lightning Electromagnetic Field Interaction with the D-Region Ionosphere","volume":"117","author":"Marshall","year":"2012","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"7185","DOI":"10.1109\/TAP.2017.2758392","article-title":"Finite-Difference Modeling of Very-Low-Frequency Propagation in the Earth-Ionosphere Waveguide","volume":"65","author":"Marshall","year":"2017","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"5037","DOI":"10.1002\/2014JD021594","article-title":"Very Low Frequency Sub Ionospheric Remote Sensing of Thunderstorm-Driven Acoustic Waves in the Lower Ionosphere","volume":"119","author":"Marshall","year":"2014","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"10230","DOI":"10.1029\/2019JA027044","article-title":"X-Ray Signatures of Lightning-Induced Electron Precipitation","volume":"124","author":"Marshall","year":"2019","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_57","unstructured":"Ferguson, J.A. (1998). Computer Programs for Assessment of Long-Wavelength Radio Communications, Version 2.0: User\u2019s Guide and Source Files, Space and Naval Warfare Systems Center."},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"L03104","DOI":"10.1029\/2008GL036535","article-title":"Full-Wave Modeling of Trans ionospheric Propagation of VLF Waves","volume":"36","author":"Lehtinen","year":"2009","journal-title":"Geophys. Res. Lett."},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"8675","DOI":"10.1109\/TAP.2021.3083753","article-title":"A New Longwave Mode Propagator for the Earth\u2013Ionosphere Waveguide","volume":"69","author":"Gasdia","year":"2021","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"21409","DOI":"10.1029\/2001JA900070","article-title":"FIRI: A Semiempirical Model of the Lower Ionosphere","volume":"106","author":"Friedrich","year":"2001","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"e2021JA029849","DOI":"10.1029\/2021JA029849","article-title":"A New Four-Parameter D-Region Ionospheric Model: Inferences from Lightning-Emitted VLF Signals","volume":"126","author":"McCormick","year":"2021","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1038\/ngeo1668","article-title":"Reduction of Electron Density in the Night-Time Lower Ionosphere in Response to a Thunderstorm","volume":"6","author":"Shao","year":"2013","journal-title":"Nat. Geosocial."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"371","DOI":"10.1029\/RS004i004p00371","article-title":"Lower Ionosphere Electron Densities Measured During the Solar Eclipse of November 12, 1966","volume":"4","author":"Mechtly","year":"1969","journal-title":"Radio Sci."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"A11302","DOI":"10.1029\/2009JA015101","article-title":"Response of the Equatorial Lower Ionosphere to the Total Solar Eclipse of 22 July 2009 during Sunrise Transition Period Studied Using VLF Signal","volume":"115","author":"Guha","year":"2010","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_65","unstructured":"Schunk, R.W. (1996). STEP Handbook of Ionospheric Models, SCOSTEP Secretariat."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"954","DOI":"10.1002\/2015MS000592","article-title":"WACCM-D\u2014Whole Atmosphere Community Climate Model with D-Region Ion Chemistry","volume":"8","author":"Verronen","year":"2016","journal-title":"J. Adv. Model. Earth Syst."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"961","DOI":"10.1016\/j.asr.2014.06.005","article-title":"Response of the Mid-Latitude D-Region Ionosphere to the Total Solar Eclipse of 22 July 2009 Studied Using VLF Signals in South Korean Peninsula","volume":"54","author":"Phanikumar","year":"2014","journal-title":"Adv. Space Res."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"616","DOI":"10.1029\/2018JA026130","article-title":"The 22 July 2009 Total Solar Eclipse: Modeling D Region Ionosphere Using Narrowband VLF Observations","volume":"124","author":"Venkatesham","year":"2019","journal-title":"J. Geophys. Res. Space Phys."},{"key":"ref_69","first-page":"399","article-title":"Effect of solar eclipse on VLF propagation","volume":"23","author":"Pant","year":"1994","journal-title":"Indian J. Radio Space Phys."},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"A12208","DOI":"10.1029\/2004JA010644","article-title":"Radiation Belt Electron Precipitation Fluxes Associated with Lightning","volume":"109","author":"Clilverd","year":"2004","journal-title":"J. Geophys. Res. Space Phys."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/12\/3025\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:51:44Z","timestamp":1760125904000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/15\/12\/3025"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,6,9]]},"references-count":70,"journal-issue":{"issue":"12","published-online":{"date-parts":[[2023,6]]}},"alternative-id":["rs15123025"],"URL":"https:\/\/doi.org\/10.3390\/rs15123025","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,6,9]]}}}