Dynamics of the convection in the inner magnetosphere by observations of the diffuse aurora, SAR arc and ionospheric drift
Abstract
The first results of the comparison of subauroral luminosity dynamics in 557,7 and 630,0 nm emission with simultaneous measurements of the ionospheric drift in the F2 region with a digisonde DPS-4 at the Yakutsk meridian (CGMC: 55-60N, 200°E) at Kp = 2-6 are presented. It is shown from the analysis of individual events that during the magnetospheric convection intensification after the turn of the IMF Bz - component to the south the equatorward extension of diffuse aurora takes place. At the same time the westward ionospheric drift velocity increases both in the diffuse aurora region and much equatorward of it due to the occurrence of the northward polarization electric field. We suppose that the generation of polarization field can be associated with the development of the region 2 FAC during the intensification of magnetospheric convection. The comparison of ground-based observations with measurements of the plasma drift aboard the DMSP-F15 satellite has been carried out.
- Publication:
-
Advances in Space Research
- Pub Date:
- April 2009
- DOI:
- 10.1016/j.asr.2008.10.003
- Bibcode:
- 2009AdSpR..43.1130I
- Keywords:
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- Subauroral latitudes;
- Diffuse aurora;
- SAR arcs;
- Interplanetary electric field;
- Magnetospheric convection;
- Region 2 FAC;
- Polarization electric field;
- Ionospheric drift