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Rotational polarities of sudden impulses in the magnetotail lobeA sudden impulse (SI) is a sudden change in the magnetic field strength which is caused by a change in the solar wind pressure and is observed throughout the magnetosphere. In this report we have examined the rotations of the magnetic field vectors at times of SIs in the magnetotail lobe, by using IMP 6, 7, and 8 magnetometer data. The following properties have been found: (1) at the time of SI the arrowhead of the magnetic vector tends to rotate in one plane; (2) the plane of rotation tends to include the unperturbed magnetic field vector; (3) the plane of rotation tends to be aligned with the radial direction from the magnetotail axis; and (4) the magnetic vectors have a particular rotational polarity: when the plane of rotation is viewed so that the Sun is to the right of the viewed plane and the magnetotail axis is to the bottom, the arrowhead of the vector tends to rotate counterclockwise in this plane. These magnetic vector properties are consistent with those expected when part of an increase in solar wind lateral pressure squeezes the magnetotail axisymmetrically while moving tailward.
Document ID
19930032364
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kawano, H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yamamoto, T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kokubun, S.
(Tokyo Univ. Japan)
Lepping, R. P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: A11
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A16361
Funding Number(s)
CONTRACT_GRANT: MOESC-62420013
Distribution Limits
Public
Copyright
Other

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