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

Owens, M. J. ORCID: https://orcid.org/0000-0003-2061-2453 and Cargill, P. J. (2002) Correlation of magnetic field intensities and solar wind speeds of events observed by ACE. Journal of Geophysical Research, 107 (A5). 1050. ISSN 0148-0227 doi: 10.1029/2001JA000238

Abstract/Summary

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.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/5837
Identification Number/DOI	10.1029/2001JA000238
Refereed	Yes
Divisions	No Reading authors. Back catalogue items
Publisher	American Geophysical Union
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