Ion Pressure in Different Regions of the Dayside Auroral Precipitationстатья
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Дата последнего поиска статьи во внешних источниках: 1 февраля 2021 г.
Аннотация:The ion pressure in the regions of ionospheric projections of the plasma mantle, polar cusp, low latitude boundary layer, and the region of structured precipitation of the auroral oval is studied during magnetic calm based on data from the DMSP F6 and F7 low-altitude spacecraft. It is shown that the level of ion pressure in all of these regions does not depend on either the polarity or the value of the Bz component of the IMF. The ion pressure in the mantle varies from 0.02 to 0.06 nPa and does not depend on the magnitude of the solar wind dynamic pressure. The average pressure level is <Pm>= 0.030.01 nPa. In the cusp area at IMF Bz > 0, the ion pressure (Pc) does not depend on the solar wind dynamic pressure (Psw), while the pressure at IMF Bz < 0 increases significantly with the increasing in Psw. The average pressure level is < Pc >= 1.0 Ѓ0.3 nPa, which is almost two orders of magnitude higher than that in the mantle. The ion pressure also increases with the solar wind dynamic pressure in both the LLBL and the auroral oval precipitation (AOP). The average pressure in the LLBL is <PL>= 0.270.07 nPa, while in the AOP region its average value is two times lower. The MLT pressure pattern in LLBL shows a pronounced increase in the noon sector (~11–14 MLT), the value of which increases with increasing in the solar wind dynamic pressure. In the AOP region the pressure is distributed over MLT fairly evenly, which results in a significant pressure difference (ΔP = PL–PA ) in the noon sector between the low-latitude boundary layer and the auroral oval.