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Postmidnight chorus - A substorm phenomenonThe ELF emissions were detected in the midnight sector of the magnetosphere in conjunction with magnetospheric substorms. The emissions were observed at local midnight and early morning hours and are accordingly called 'post-midnight chorus.' The characteristics of these emissions such as their frequency time structure, emission frequency with respect to the local equatorial electron gyrofrequency, intensity-time variation, and the average intensity were investigated. The occurrence of the chorus in the nightside magnetosphere was investigated as a function of local time, L shell, magnetic latitude, and substorm activity, and the results of this analysis are presented. Specific features of postmidnight chorus are discussed in the context of possible wave-particle interactions occurring during magnetospheric substorms.
Document ID
19740035614
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tsurutani, B. T.
Smith, E. J.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Journal of Geophysical Research
Volume: 79
Subject Category
Geophysics
Report/Patent Number
NSSDC-ID-68-014A-14-OS
NSSDC-ID-68-014A-18-OS
NSSDC-ID-68-014A-16-PM
Accession Number
74A18364
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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