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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 107, NO. A5,
1050,
doi:10.1029/2001JA000238,
2002
Correlation of magnetic field intensities and solar wind speeds of events observed by ACE
Mathew J. Owens
Space and Atmospheric Physics, Blackett Laboratory,
Imperial College,
London,
United Kingdom
Peter J. Cargill
Space and Atmospheric Physics, Blackett Laboratory,
Imperial College,
London,
United Kingdom
Abstract
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.
Published 10
May
2002.
Index Terms: 2111 Interplanetary Physics: Ejecta, driver gases, and magnetic clouds; 2134 Interplanetary Physics: Interplanetary magnetic fields; 7513 Solar Physics, Astrophysics, and Astronomy: Coronal mass ejections.
Read Full Article (file size: 213146 bytes) Cited by
Citation: Owens, M. J., and P. J. Cargill
(2002),
Correlation of magnetic field intensities and solar wind speeds of events observed by ACE,
J. Geophys. Res.,
107(A5),
1050,
doi:10.1029/2001JA000238.
Copyright 2002 by the American Geophysical Union.
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