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Coincident bursts of auroral kilometric radiation and VLF emissions associted with a type 3 solar radio noise eventThis paper examines an isolated magnetospheric VLF/radio noise event that is highly suggestive of the triggering of terrestrial auroral kilometric radiation (AKR) bu solar type III radio emission and of a close relation between AKR and broadband hiss. The solar type III burst was measured on polar HF riometers and was coincident with local dayside VLF/LF noise emission bursts at South Pole station. It was also coincident with AKR bursts detected onthe AMPTE/IRM satellite, at the same magnetic local time as South Pole. On the basis of the close association of AKR and VLF bursts, and from geometric considerations relating to wave propagation, it is likely that the AKR source was on the dayside and on field lines near South Pole station. The general level of geomagnetic activity was very low. However, an isolated magnetic impulse event (MIE) accompanied by a riometer absorption pulse was in progress when all of the VLF/radio noise bursts occurred. The very close association of the typew III burst at HF with the AKR is consistent with external stimulation of the AKR, is different, more immediate,triggering process than that implied by Calvert (1981) is invoked. It is suggested here that some of the HF solar radiant energy may decay into waves with frequences comparable to those of the AKR by paraetric excitation or some other process, thus providing the few background photons required for the generation of AKR by the WU and Lee (1979) cyclotron maser instability. The AKR, perhaps by modifying the magnetospheric electron velocity distribution, might have produced the observed VLF emissions. Alternatively, the VLF emissions may have arisen from the same anisotropic and unstable electron distribution function responsible for the AKR.
Document ID
19950053485
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rosenberg, T. J.
(Univ. of Maryland, College Park, MD United States)
Singh, S.
(Univ. of Maryland, College Park, MD United States)
Wu, C. S.
(Univ. of Maryland, College Park, MD United States)
Labelle, J.
(Dartmouth College, Hanover, NH United States)
Treumann, R. A.
(Dartmouth College, Hanover, NH United States)
Inan, U. S.
(Standford Univ. Standford, CA, United States)
Lanzerotti, L. J.
(AT&T Bell Laboratories, Murray Hill, NJ United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: A1
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A85084
Funding Number(s)
CONTRACT_GRANT: NAGW-1661
CONTRACT_GRANT: NSF DPP-88-18229
CONTRACT_GRANT: NSF DPP-89-15635
CONTRACT_GRANT: NSF DPP-91-19753
CONTRACT_GRANT: NSF DPP-89-18326
CONTRACT_GRANT: NSF OPP-93-17621
Distribution Limits
Public
Copyright
Other

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