Correlation of magnetic field intensities and solar wind speeds of events observed by ACE

Details Correlation of magnetic field intensities and solar wind speeds of events observed by ACE Correlation of magnetic field intensities and solar wind speeds of events observed by ACE

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1050o&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A5, pp. SSH 1-1, CiteID 1050, DOI 10.1029/2001JA000238

Astronomy and Astrophysics

Astrophysics

1

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections

Scientific paper

The relationship between the magnetic field intensity and speed of solar wind events is examined using ~3 years of data from the ACE spacecraft. No preselection of coronal mass ejections (CMEs) or magnetic clouds is carried out. The correlation between the field intensity and maximum speed is shown to increase significantly when |B| > 18 nT for 3 hours or more. Of the 24 events satisfying this criterion, 50% are magnetic clouds, the remaining half having no ordered field structure. A weaker correlation also exists between southward magnetic field and speed. Sixteen of the events are associated with halo CMEs leaving the Sun 2 to 4 days prior to the leading edge of the events arriving at ACE. Events selected by speed thresholds show no significant correlation, suggesting different relations between field intensity and speed for fast solar wind streams and ICMEs.

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