Geosynchronous magnetic field responses to interplanetary shocks

Details Geosynchronous magnetic field responses to interplanetary shocks Geosynchronous magnetic field responses to interplanetary shocks

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13b1803p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM13B-1803

Physics

[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

It has been reported that geosynchronous magnetopause crossings are more frequently observed in the prenoon sector than in the postnoon sector, indicating a dawn-dusk magnetopause asymmetry during extreme solar wind conditions. Motivated by these observations, we investigate geosynchronous magnetic field variations normalized to SYM-H when sudden commencements (SC) associated with interplanetary shock are observed on the ground. From a statistical analysis of the geosynchronous magnetic field responses to SC events from 1997 to 2006, we found that the normalized SC amplitude at geosynchronous orbit is larger in the morning sector than in the afternoon sector. In order to examine if this morning-afternoon asymmetry at geosynchronous orbit occurs only during disturbed geomagnetic conditions, we compared the geosynchronous magnetic field strength obtained in the morning and afternoon during undisturbed intervals (Kp < 3). We found that the asymmetry appears under undisturbed geomagnetic conditions. This indicates that the morning-afternoon asymmetry was not strongly affected by changes in solar wind condition. Using solar wind data and TS04 model field, we discuss what causes the morning-afternoon asymmetry at geosynchronous orbit. In addition, we observed SC-associated negative responses at geosynchronous orbit between 2100 MLT and 0300 MLT. The time lags between SC onset on the ground and the negative onset at geosynchronous orbit are about 3-5 minutes. We examine if the ground-space time lags are due to the MHD fast mode propagation or due to other mechanisms as comparing global MHD simulation.

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