B. Gustavsson, A. Steen, T. Sergienko, B.U.E. Brändström
{"title":"估计极光电子能谱，地面多站光学测量的功率","authors":"B. Gustavsson, A. Steen, T. Sergienko, B.U.E. Brändström","doi":"10.1016/S1464-1917(00)00106-9","DOIUrl":null,"url":null,"abstract":"<div><p>Ground-based multi-station optical imaging has a great inherent scientific potential for investigations of the magnetosphere-ionosphere-thermosphere interactions by using inversions of the ionospheric optical signal, the aurora.</p><p>Two methods for estimating characteristics of primary auroral electron spectra are compared and used to describe an auroral event. One method uses the spectral information in the images and the other method is based on the inversion of the <em>N</em><sub>2</sub><sup>+</sup>1<em>NG</em> 4287 Å altitude distribution. With the second method ALIS can currently give estimates of the primary electron distribution with medium time resolution (10 s).</p><p>The auroral event, a passage of an eastward moving fold in a pre-existing auroral arc, is analysed and characteristics of the precipitating electrons show regions with different fluxes, e.g. a soft region that has previously been found inside the fold appears to belong to a wider region of soft precipitation that emerges as the arc activates.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 189-194"},"PeriodicalIF":0.0000,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00106-9","citationCount":"10","resultStr":"{\"title\":\"Estimate of auroral electron spectra, the power of ground-based multi-station optical measurements\",\"authors\":\"B. Gustavsson, A. Steen, T. Sergienko, B.U.E. Brändström\",\"doi\":\"10.1016/S1464-1917(00)00106-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Ground-based multi-station optical imaging has a great inherent scientific potential for investigations of the magnetosphere-ionosphere-thermosphere interactions by using inversions of the ionospheric optical signal, the aurora.</p><p>Two methods for estimating characteristics of primary auroral electron spectra are compared and used to describe an auroral event. One method uses the spectral information in the images and the other method is based on the inversion of the <em>N</em><sub>2</sub><sup>+</sup>1<em>NG</em> 4287 Å altitude distribution. With the second method ALIS can currently give estimates of the primary electron distribution with medium time resolution (10 s).</p><p>The auroral event, a passage of an eastward moving fold in a pre-existing auroral arc, is analysed and characteristics of the precipitating electrons show regions with different fluxes, e.g. a soft region that has previously been found inside the fold appears to belong to a wider region of soft precipitation that emerges as the arc activates.</p></div>\",\"PeriodicalId\":101026,\"journal\":{\"name\":\"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science\",\"volume\":\"26 1\",\"pages\":\"Pages 189-194\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00106-9\",\"citationCount\":\"10\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1464191700001069\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1464191700001069","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Estimate of auroral electron spectra, the power of ground-based multi-station optical measurements
Ground-based multi-station optical imaging has a great inherent scientific potential for investigations of the magnetosphere-ionosphere-thermosphere interactions by using inversions of the ionospheric optical signal, the aurora.
Two methods for estimating characteristics of primary auroral electron spectra are compared and used to describe an auroral event. One method uses the spectral information in the images and the other method is based on the inversion of the N2+1NG 4287 Å altitude distribution. With the second method ALIS can currently give estimates of the primary electron distribution with medium time resolution (10 s).
The auroral event, a passage of an eastward moving fold in a pre-existing auroral arc, is analysed and characteristics of the precipitating electrons show regions with different fluxes, e.g. a soft region that has previously been found inside the fold appears to belong to a wider region of soft precipitation that emerges as the arc activates.
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