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Large-scale structure of solar wind and appearance of supersubstormsстатья Исследовательская статья
- Авторы: Despirak I.V., Lubchich A.A., Kleimenova N.G.
- Журнал: Physics of Auroral Phenomena
- Год издания: 2018
- Издательство: Федеральное государственное бюджетное научное учреждение "Полярный геофизический институт"
- Местоположение издательства: Апатиты
- Первая страница: 11
- Последняя страница: 13
- DOI: 10.25702/KSC.2588-0039.2018.41.11-13
- Аннотация: It is carried out the comparative analysis of the space weather conditions for supersubstorms (SSS) appearance. For this purpose, the data of SuperMAG global magnetometers network and the data of IMAGE magnetometers network were used. SSS events, the so-called supersubstorms, are particularly intense substorms (SML< - 2500 nT; AL < -2500 nT). The solar wind and IMF parameters were taken from the OMNI database and the catalog of large-scale solar wind types (ftp://ftp.iki.rssi.ru/omni/). Total 131 SSS events were registered for 1998-2016 years at SuperMAG network and 26 SSS events at IMAGE network. It is shown that the SSS substorms were observed mainly during the magnetic cloud (MC) of the solar wind (in 42% of cases) and during plasma compression region before MC or EJECTA (SHEATH) (in 45.2% of cases). Sometimes SSS events were registered during EJECTA (in 8.3% of cases) and during plasma compression region before high-speed streams CIR (in 2.5% of cases). Thus, it is seen that the SSS events were associated only with interplanetary displays of the coronal mass ejections (Sheaths, magnetic clouds and EJECTA) and almost did not observed during high speed streams from coronal holes (FAST). Perhaps, this is happened due to the fact that SSS can occur during super (Dst<-250 nT) and intense (-100 nT> Dst> -250 nT) magnetic storms. On the other hand, it is well known that these storms are usually caused by southward interplanetary magnetic field component Bs during MCs or Sheaths. However, sometimes SSS events were registered during intervals with Dst >-50 nT (in 13.4% of cases). But there are mainly events during storm onset (10.8%) and recovery phase (1.2%) and only two SSS events were registered during non-storm conditions (1.2%). We believe that the most likely space weather conditions for the SSS appearance are associated with enhanced values of the solar wind speed and dynamic pressure, as well as the magnitude of the Interplanetary Magnetic Field (IMF) under the southward direction of the IMF.
- Добавил в систему: Клейменова Наталья Георгиевна