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Echo 2 - Observations at Fort Churchill of a 4-keV peak in low-level electron precipitationThe Echo 2 rocket flight launched from Fort Churchill, Manitoba, offered the opportunity to observe high-latitude low-level electron precipitation during quiet magnetic conditions. Although no visual aurora was evident at the time of the flight, an auroral spectrum sharply peaked at a few keV was observed to have intensities from 1 to 2 orders of magnitude lower than peaked spectra typically associated with bright auroral forms. There is a growing body of evidence that relates peaked electron spectra to discrete aurora. The Echo 2 observations show that whatever the mechanism for peaking the electron spectrum in and above discrete forms, it operates over a range of precipitation intensities covering nearly 3 orders of magnitude down to subvisual or near subvisual events.
Document ID
19750050965
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Arnoldy, R. L.
Hendrickson, R. A.
Winckler, J. R.
(Minnesota, University Minneapolis, Minn., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1975
Publication Information
Publication: Journal of Geophysical Research
Volume: 80
Subject Category
Geophysics
Accession Number
75A35037
Funding Number(s)
CONTRACT_GRANT: NGL-24-005-008
CONTRACT_GRANT: NGR-24-005-111
Distribution Limits
Public
Copyright
Other

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