The Solar Wind Energy Input Rate and Recovery of the Magnetospheric Ring Current during the Last Two Solar Cycles

Details The Solar Wind Energy Input Rate and Recovery of the Magnetospheric Ring Current during the Last Two Solar Cycles The Solar Wind Energy Input Rate and Recovery of the Magnetospheric Ring Current during the Last Two Solar Cycles

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sunge...3...46b&link_type=abstract

Sun and Geosphere, vol.3, no.1, p.46-51

Computer Science

Scientific paper

This study presents the recent results of our calculations of the solar wind energy input rate to the magnetospheric ring current in the main phase of magnetic storms used for simulation of Dst index based on solar wind data. For this purpose we studied the solar wind parameters during the last two solar cycles. We looked for geomagnetic storms and intervals appropriate for calculation of the function of solar wind energy input rate to the ring current. Intense solar and geomagnetic activity that had occurred in October - November 2003 and in July and November 2004 allowed us to find intervals for calculation of the solar wind energy input rate for a wide range of the solar wind electric field. It should be noted that previous calculations of the solar wind energy input rate to the magnetospheric ring current were carried out for values of the solar wind electric field limited up to 16 mV/m. Furthermore, during the 22-nd and 23-rd solar cycles there were a lot of small and moderate geomagnetic storms which enabled us to correct the injection functions for the magnetospheric ring current. These calculations show us that, as in the case of small and medium storms, the relationship between rate change of the ring current and Ey-component of the solar wind electric field remains linearly proportional for great Ey values. The behavior of the decay constant - in the main phase of a geomagnetic storm and its recovery phase is different. For severe storms the characteristic time of the ring current decay is about 15-16 hours when its recovery is free from injection and it is about 3.5-6 hours when an interplanetary injection takes place.

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