Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh61a02y&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH61A-02
Other
7513 Coronal Mass Ejections, 7531 Prominence Eruptions
Scientific paper
Coronal mass ejections are often associated with erupting magnetic structures or disappearing filaments. Majority of CMEs headed directly toward the earth are observed at 1AU as magnetic clouds --- region in the solar wind where the magnetic field strength is higher than average and smooth rotation of the magnetic field vectors. The 3D structure of magnetic clouds can be represented by force-free flux rope. When a CME reaches the earth, it may or may not cause magnetic storms, alter Earth's magnetic field or produce the phenomena known as auroras. The geoeffectiveness of a solar CME depends on the orientation of the magnetic field in it. Two M-class solar flares erupted on February 17, 2000. The second flare occurred near a small active region NOAA 8872. The eruption was accompanied by a halo CME. However the February 17 CME did not trigger any magnetic activity at the time it arrived at the earth. Another powerful flare on July 14, 2000 was also associated with a halo CME, which caused strongest geomagnetic activity in the solar cycle 23. Using ACE measurements of the interplanetary magnetic fields we study the orientation of the magnetic flux ropes in both magnetic clouds and compare it to the orientaion of solar magnetic fields and disappearing filaments. We find that the direction of the axial filed in the flux ropes and their helicity are consistent with the direction of the axial field and helicity of the erupted filaments. Thus, the geoeffectiveness of a CME is defined by the orientation and structure of the erupted filament and by its magnetic helicity as well. We also suggest that geoeffectiveness of a CME can be forecasted using daily full disk Hα and Yohkoh images and MDI magnetograms as well.
Deng Youjin
Goode Philip. R.
Wang Hai-Hong
Yurchyshyn Vasyl
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