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Interplanetary Alfven waves and auroral (substorm) activity - IMP 8Almost 1 year of IMP 8 interplanetary magnetic field and plasma data (days 1-312, 1979) have been examined to determine the interplanetary causes of geomagnetic AE activity. The nature of the interplanetary medium (Alfvenic or non-Alfvenic) and the B(s) correlation with AE were examined over 12-hour increments throughout the study. It is found that Alfvenic wave intervals are present over 60 percent of the time, and the southward component of the Alfven waves is well correlated with AE (average peak correlation coefficient 0.62), with a median lag of 43 min. From this statistical study, no major differences in the magnetospheric response to Alfvenic and non-Alfvenic intervals were obvious. The high-intensity long-duration continuous AE activity (HILDCAA) events discussed previously by Tsurutani and Gonzales (1987) are demonstrated to be caused by the southward components of the Alfven waves, presumably through the process of magnetic reconnection.
Document ID
19900039383
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tsurutani, Bruce T.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gould, Tom
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Goldstein, Bruce E.
(JPL Pasadena, CA, United States)
Gonzalez, Walter D.
(Instituto de Pesquisas Espaciais Sao Jose dos Campos, Brazil)
Sugiura, Masahisa
(Kyoto University Japan)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Journal of Geophysical Research
Volume: 95
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
90A26438
Distribution Limits
Public
Copyright
Other

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