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Non-E x B ordered ion beams upstream of the earth's bow shockThe unexpected appearance of spin modulations in the fixed voltage electrostatic analyzer detectors on ISEE 1 and 2 has made it possible to study the plasma properties of the upstream ions in high time resolution. Using an isotropic flowing Maxwellian distribution to model the count rate modulations, estimates have been obtained of the local plasma temperature and three-dimensional flow velocity of the observed upstream ion population. It is found that in almost all of the observations of upstream particles there exist beam-like ions with temperatures in the range 5-80 eV. Their flow velocities cannot be ordered by E x B. This last point separates these observations from the previously reported reflected and diffuse populations of upstream ions. Mechanisms that can gyrophase bunch the ions reflected at the bow shock are discussed as a method of explaining the data.
Document ID
19810054532
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gurgiolo, C.
(Washington Univ. Seattle, WA, United States)
Parks, G. K.
(Washington Univ. Seattle, WA, United States)
Mauk, B. H.
(Washington, University Seattle, WA, United States)
Anderson, K. A.
(Washington Univ. Seattle, WA, United States)
Lin, R. P.
(California, University Berkeley, CA, United States)
Reme, H.
(Centre d'Etude Spatiale des Rayonnements Toulouse, France)
Lin, C. S.
(Washington Univ. Seattle, WA, United States)
Date Acquired
August 11, 2013
Publication Date
June 1, 1981
Subject Category
Geophysics
Accession Number
81A38936
Funding Number(s)
CONTRACT_GRANT: NAS5-25980
CONTRACT_GRANT: NSF ATM-80-0246
Distribution Limits
Public
Copyright
Other

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