{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T22:51:30Z","timestamp":1768344690771,"version":"3.49.0"},"reference-count":62,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2024,5,10]],"date-time":"2024-05-10T00:00:00Z","timestamp":1715299200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001843","name":"Government of India","doi-asserted-by":"publisher","award":["CRG\/2019\/003394"],"award-info":[{"award-number":["CRG\/2019\/003394"]}],"id":[{"id":"10.13039\/501100001843","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The equatorial post-sunset ionospheric irregularities induce rapid fluctuations in the phase and amplitude of global navigation satellite system (GNSS) signals which may lead to the loss of lock and can potentially degrade the position accuracy. This study presents a new analysis of L-band scintillation from a low latitude station at Guntur (Geographic 16.44\u00b0N, 80.62\u00b0E, dip 22.18\u00b0), India, for the period of 18 months from August 2021 to January 2023. The observations are categorized either in the medium Earth-orbiting (MEO) or geosynchronous orbiting (GSO) satellites (GSO is considered as a set of the geostationary and inclined geosynchronous satellites) for L1, L2, and L5 signals. The results show a higher occurrence of moderate (0.5 &lt; S4 \u2264 0.8) and strong (S4 &gt; 0.8) scintillations on different signals from the MEO compared to the GSO satellites. Statistically, the average of peak S4 values provides a higher confidence in the severity of scintillations on a given night, which is found to be in-line with the scintillation occurrences. The percentage occurrence of scintillation-affected satellites is found to be higher on L1 compared to other signals, wherein a contrasting higher percentage of affected satellites over GSO than MEO is observed. While a clear demarcation between the L2\/L5 signals and L1 is found over the MEO, in the case of GSO, the CCDF over L5 is found to match mostly with the L1 signal. This could possibly originate from the space diversity gain effect known to impact the closely spaced geostationary satellite links. Another major difference of higher slopes and less scatter of S4 values corresponding to L1 versus L2\/L5 from the GSO satellite is found compared to mostly non-linear highly scattered relations from the MEO. The distribution of the percentage of scintillation-affected satellites on L1 shows a close match between MEO and GSO in a total number of minutes up to ~60%. However, such a number of minutes corresponding to higher than 60% is found to be larger for GSO. Thus, the results indicate the possibility of homogeneous spatial patterns in a scintillation distribution over a low latitude site, which could originate from the closely spaced GSO links and highlight the role of the number of available satellites with the geometry of the links, being the deciding factors. This helps the ionospheric community to develop inter-GNSS (MEO and GSO) operability models for achieving highly accurate positioning solutions during adverse ionospheric weather conditions.<\/jats:p>","DOI":"10.3390\/rs16101698","type":"journal-article","created":{"date-parts":[[2024,5,13]],"date-time":"2024-05-13T08:33:03Z","timestamp":1715589183000},"page":"1698","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Comparative Analysis of the Effect of Orbital Geometry and Signal Frequency on the Ionospheric Scintillations over a Low Latitude Indian Station: First Results from the 25th Solar Cycle"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0495-4509","authenticated-orcid":false,"given":"Ramkumar","family":"Vankadara","sequence":"first","affiliation":[{"name":"Department of ECE, KL Deemed to be University, Koneru Lakshmaiah Education Foundation, Guntur 522302, Andhra Pradesh, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4276-2420","authenticated-orcid":false,"given":"Nirvikar","family":"Dashora","sequence":"additional","affiliation":[{"name":"National Atmospheric Research Laboratory, Gadanki 517112, Andhra Pradesh, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5655-3585","authenticated-orcid":false,"given":"Sampad Kumar","family":"Panda","sequence":"additional","affiliation":[{"name":"Department of ECE, KL Deemed to be University, Koneru Lakshmaiah Education Foundation, Guntur 522302, Andhra Pradesh, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7492-7333","authenticated-orcid":false,"given":"Jyothi Ravi Kiran Kumar","family":"Dabbakuti","sequence":"additional","affiliation":[{"name":"Department of Internet of Things, KL Deemed to be University, Koneru Lakshmaiah Education Foundation, Guntur 522302, Andhra Pradesh, India"}]}],"member":"1968","published-online":{"date-parts":[[2024,5,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"324","DOI":"10.1109\/PROC.1982.12313","article-title":"Radio Wave Scintillations in the Ionosphere","volume":"70","author":"Yeh","year":"1982","journal-title":"Proc. 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