Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21a..05l&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH21A-05
Physics
7513 Coronal Mass Ejections, 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2162 Solar Cycle Variations (7536)
Scientific paper
We present a comprehensive analysis of magnetic cloud events observed by the Advanced Composition Explorer spacecraft. We fit the standard cylindrically symmetric force-free constant alpha magnetic field model to each event and examine the model parameter distributions. In general, our parameter distributions agree with results of previous studies. Based on significant differences in many plasma and composition quantities we distinguish between fast (< Vrad > >= 500 km/s) and slow (< Vrad > < 500 km/s) magnetic clouds and note the differences in their size and axial field strength distributions. In addition, we examine some physical properties of these clouds such as average Fe charge state, axial current, and magnetic flux. The cloud orientation evolution during solar cycle 23 is considered and compared to the corresponding time period of solar cycle 21. We also compare our magnetic cloud frequency to the variation in sunspot number and the variation in the dipole and quadrupole moments of the photospheric magnetic field.
Antiochos Spiro K.
Fisk Len A.
Lynch Benjamin J.
Zurbuchen Thomas H.
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