Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23a0315s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH23A-0315
Other
2102 Corotating Streams, 2139 Interplanetary Shocks, 2164 Solar Wind Plasma, 2722 Forecasting (7924, 7964), 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Some solar sunspot groups in the northern and southern hemispheres are linked by magnetic flux tubes (transequatorial magnetic flux tubes), which have been observed to brighten prior to the onset of geomagnetic storms. We have examined several of these events and linked the meridional orientation of the flux tube to satellite observations of the IMF and solar wind plasma near Earth. On October 19, 1998, the IMF and solar plasma observed by the satellite ACE showed intense disturbances followed by a weak shock. The high IMF magnitude and low density indicated the arrival of a magnetic flux rope with helical magnetic configuration. However, the time variations of IMF Bx, By and Bz components indicate that the helical magnetic configuration was not a flux rope lying in the equatorial plane, but perpendicular to it in the meridional plane. We were able to simulate the ACE observations by using the three-dimensional HAF (Hakamada-Akasofu-Fry) solar wind model, combined with a flux rope model in the solar meridional plane. The simulation also shows that the weak shock leading to a storm sudden commencement around 18 UT on October 18, 1998 was caused by a corotating interaction region (CIR). No flares and no coronal mass ejections (CMEs) were observed as the source of the interplanetary disturbances for several days before the event, but there were active sunspot groups in both the northern and southern hemispheres. Although there were no observations to confirm possible activation of the flux in this particular case, we have found several other similar cases in which the trans-equatorial flux brightened a few days before geomagnetic storms.
Akasofu Syun
Deehr Charles
Dryer Murray
Fry C.
Saito Takesi
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