{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T00:19:23Z","timestamp":1775175563658,"version":"3.50.1"},"reference-count":70,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T00:00:00Z","timestamp":1618358400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>European near-noontime ionosonde observations were considered during the period of deep solar minimum in 2008\u20132009 to analyze foF2 perturbations not related to solar and geomagnetic activity. Sudden stratospheric warming (SSWs) events in January 2008 and 2009 were analyzed. An original method was used to retrieve aeronomic parameters from observed electron concentration in the ionospheric F-region. Atomic oxygen was shown to be the main aeronomic parameter responsible both for the observed day-to-day and long-term (during SSWs) foF2 variations. Atomic oxygen rather than neutral temperature mainly controls the decrease of thermospheric neutral gas density in the course of the SSW events. Day-to-day variations of thermospheric circulation and an intensification of eddy diffusion during SSWs are suggested to be the processes changing the atomic oxygen abundance in the upper atmosphere for the periods in question. Recent Global-Scale Observations of the Limb and Disk (GOLD) observations of O\/N2 column density confirm the depletion of the atomic oxygen abundance not related to geomagnetic activity during SSWs.<\/jats:p>","DOI":"10.3390\/rs13081514","type":"journal-article","created":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T15:30:39Z","timestamp":1618414239000},"page":"1514","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Mid-Latitude Daytime F2-Layer Disturbance Mechanism under Extremely Low Solar and Geomagnetic Activity in 2008\u20132009"],"prefix":"10.3390","volume":"13","author":[{"given":"Andrey V.","family":"Mikhailov","sequence":"first","affiliation":[{"name":"Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Troitsk, 108840 Moscow, Russia"},{"name":"Istituto Nazionale di Geofisica e Vulcanologia (INGV), 00143 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4335-0345","authenticated-orcid":false,"given":"Loredana","family":"Perrone","sequence":"additional","affiliation":[{"name":"Istituto Nazionale di Geofisica e Vulcanologia (INGV), 00143 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5171-0438","authenticated-orcid":false,"given":"Anatoly A.","family":"Nusinov","sequence":"additional","affiliation":[{"name":"Fedorov Institute of Applied Geophysics (IAG), 129128 Moscow, Russia"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,14]]},"reference":[{"key":"ref_1","first-page":"1006","article-title":"Morphology of quiet time F2-layer disturbances: High and lower latitudes","volume":"5","author":"Mikhailov","year":"2004","journal-title":"Int. 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