Main features of the IMF sector structure during 23 circle of solar activity
Abstract
The sector structure of interplanetary magnetic field (SS IMF) have a strong effect on the geomagnetic field variations in the polar cap. It was discovered by L. Svalgaard and S. Mansurov and used to estimate the effects of solar wind in the near earth space. The regular definition of SS IMF was done based on the data from Resolute Bay and Vostok stations and is displayed in the table format at http://www.izmiran.rssi.ru/magnetism/SSIMF/index.htm. The regular definition of SS IMF based on the computer routine which include the adaptive filtering spectral analysis of geomagnetic variations. The main features of SS IMF are the reflections of variations in the regular heliospheric current sheet. The changes in the signs of SS IMF are most pronounced in the variations of Z-component on the geomagnetic observatories near 80 degrees of corrected geomagnetic latitudes. The changes of SS IMF also might be inferred from the geomagnetic data of the observatories in middle and low latitudes. As a sample we analyze the data of Moscow and Kakioka observatories for some chosen periods and shown a good coincidence with SS IMF in high latitudes. These results also confirm that the changes of the SS IMF signs have the global effects in the geomagnetic variations.
- Publication:
-
Proceedings of the ILWS Workshop
- Pub Date:
- 2006
- Bibcode:
- 2006ilws.conf..262Z
- Keywords:
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- Geomagnetic variations;
- sector structure of interplanetary magnetic field (SS IMF);
- solar wind.