Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11205102s&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A5, CiteID A05102
Astronomy and Astrophysics
Astrophysics
2
Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Magnetic Fields, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Solar Physics, Astrophysics, And Astronomy: Magnetic Fields
Scientific paper
Some intense geomagnetic storms have no clear solar activity several days prior to their onset (SSC). On the other hand, some of such storms are associated with an unmistakable indication of magnetic flux ropes in interplanetary space. We found that some of such SSC geomagnetic storms occurred several days after the passage of transequatorial loops on the central part of the solar disk; transequatorial magnetic loops connect sunspot groups between the northern and southern hemispheres and at times show some brightening activity for a day or so. Since transequatorial loops must have the IMF Bz component, we examined them as a new possible source of geomagnetic storms, in addition to solar flares and filament disappearances.
Akasofu Syuh-Ichi
Deehr Charles S.
Saito Takao
Sun WaiChing
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