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Simultaneous ground-based and DMSP F16 spacecraft observations of the dayside polar cusp under northward IMF: case studyтезисы доклада
- Авторы: Vorobjev V.G., Yagodkina O.I., Antonova E.E.
- Сборник: PHYSICS OF AURORAL PHENOMENA 46th Annual Seminar Abstracts
- Том: 34
- Тезисы
- Год издания: 2023
- Место издания: Polar Geophysical Institute, Apatity
- Первая страница: 31
- Последняя страница: 31
- Аннотация: Ground-based optical observations at the Barentsburg observatory (Spitsbergen) during DMSP F16 spacecraft pass through the dayside polar cusp under northward IMF on December 22, 2003 were examined. Precipitating particles observations with F16 allowed us to determine both the location of equatorward and poleward cusp boundaries and latitudinal structure of precipitation near geomagnetic noon. According OMNI Web data IMF Bz component turned northward about 12 min before cusp crossing and kept northward direction about more 12 min after this one. In ground optical observations, the cusp was associated with luminosity in the 630.0 nm emission showing a smooth maximum of ~1 kR in the northward half of cusp precipitation. At the north site, the cusp was edged with the rayed arc (RA) and about 02° latitudinal width burst in the electron energy flux. The average energy of electrons was ~0.13 keV in the cusp precipitation and ~ 0.24 keV with a spectral maximum at about 0.4 keV in RA. The brightness of RA in the 557.7 nm auroral emission during positive Bz changed about from 1 to 2 kR to be in a good correlation with AL index of magnetic activity. Main features of the observed event and possible mechanisms of RA formation are discussed.
- Добавил в систему: Антонова Елизавета Евгеньевна