{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,2]],"date-time":"2026-03-02T18:22:33Z","timestamp":1772475753250,"version":"3.50.1"},"reference-count":17,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2022,9,18]],"date-time":"2022-09-18T00:00:00Z","timestamp":1663459200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science and Higher Education (MSHE), Poland","award":["6\/E-73\/SPUB\/SP\/2019"],"award-info":[{"award-number":["6\/E-73\/SPUB\/SP\/2019"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>We try to assess the validity of assumptions taken when deriving drift velocity. We give simple formulas for characteristics of the spatiotemporal correlation function of the observed diffraction pattern for the frozen flow and the more general Briggs model. Using Low-Frequency Array (LOFAR) Cassiopeia intensity observation, we compare the experimental velocity scaling factor with a theoretical one to show that both models do not follow observations. We also give a qualitative comparison of our drift velocity estimates with SuperDARN convection maps. The article is essentially an extended version of the conference paper: \u201cDetermining ionospheric drift and anisotropy of irregularities from LOFAR core measurements\u201d, Signal Processing Symposium 2021 (SPSympo 2021).<\/jats:p>","DOI":"10.3390\/rs14184655","type":"journal-article","created":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T04:49:22Z","timestamp":1663562962000},"page":"4655","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Determining Ionospheric Drift and Anisotropy of Irregularities from LOFAR Core Measurements: Testing Hypotheses behind Estimation"],"prefix":"10.3390","volume":"14","author":[{"given":"Marcin","family":"Grzesiak","sequence":"first","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6467-7091","authenticated-orcid":false,"given":"Mariusz","family":"Po\u017coga","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2063-3545","authenticated-orcid":false,"given":"Barbara","family":"Matyjasiak","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"given":"Dorota","family":"Przepi\u00f3rka","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"given":"Katarzyna","family":"Beser","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9128-3514","authenticated-orcid":false,"given":"Lukasz","family":"Tomasik","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"given":"Hanna","family":"Rothkaehl","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]},{"given":"Helena","family":"Ciechowska","sequence":"additional","affiliation":[{"name":"Space Research Centre of the Polish Academy of Sciences, 00-716 Warsaw, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,18]]},"reference":[{"key":"ref_1","first-page":"53","article-title":"LOFAR: The low-frequency array","volume":"556","author":"Haarlem","year":"2013","journal-title":"Astron. 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