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The Effect of Interruption of “Serpentine Emission” (SE) in the Polar Cap during Geomagnetic Storm Sudden Commencements (SSC)статья
- Авторы: Kurazhkovskaya N.A., Klain B.I.
- Журнал: Geomagnetism and Aeronomy
- Том: 62
- Номер: 5
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 573
- Последняя страница: 581
- DOI: 10.1134/S0016793222040107
- Аннотация: The behavior of the carrier frequency of electromagnetic emission in a range of 0.1–5 Hz of the“serpentine emission” (SE) type, which is observed in the polar cap region during geomagnetic storm suddencommencements (SSC), is studied. The unique analog magnetic records of the Vostok Antarctic observatory(corrected geomagnetic coordinates Φ' = –85.41°, Λ' = 69.01°), which have been digitized at high resolution(20 Hz) and are freely available on the website of the World Data Center for the Solar-Terrestrial Physics,Moscow, are used for the analysis. It is found that at the time of SSC at the Vostok observatory, a noise broadbandelectromagnetic emission was observed in the Pc1–2 range with a sharp edge, which led to a violationof the SE generation mode. The disruption of the SE excitation manifested itself in the interruption of thecarrier frequency of emission with the subsequent renewal. In this paper, 92 cases of SSC observations werestudied, for which the SE recording data were available. The effect of SE interruption during SSC was notedin more than 80% of cases, regardless of the fact whether or not a geomagnetic storm subsequently developedand of the storm intensity. The “serpentine emission” that lasted continuously for hours and even days wasinterrupted at the SSC moment in the dominant number of cases for approximately 2–3 h, which is significantlyless than the average duration of the main phase and the duration of the storm itself. It is shown that the SEcarrier frequency gradually decreased approximately 2 h before the SSC moment. It is assumed that an interplanetarydisturbance, following the shock wave front, excites a broadband noise emission in the polar cap,which violates the SE generation mode.
- Добавил в систему: Куражковская Надежда Андреевна