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Auroral zone microbursts, substructures, and a model for microburst precipitationThe spatial and temporal characteristics of X-ray microbursts detected by collimated directional telescopes have been analyzed in detail. Results indicate the presence of a persistent periodicity of about 0.5 second and 1.2 seconds, respectively. In one event, microbursts exhibit fine structures similar to those observed by Lampton (1967). These substructures are poorly correlated in both space and time as indicated by the low correlation coefficients obtained in auto- and cross-correlation analyses between various pairs of telescopes. The source dimension of these substructures is deduced to be less than 18 km at ionospheric heights. By considering that microburst electrons are near regions of strong diffusion, we show that microburst precipitation can be generated if electric field turbulence is present in the magnetosphere. We argue that electrons of about 50 keV in bounce resonance with a parallel electric field of about 1 millivolt/meter at about 1 Hz can account for the microburst period as well as the precipitation lifetime of about 0.2 second.
Document ID
19750051487
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Parks, G. K.
(Washington, University Seattle, Wash., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Geophysics
Meeting Information
Meeting: International Conference on X-Rays in Space - Cosmic, Solar, and Auroral X-Rays, Calgary
Location: Alberta
Country: Canada
Start Date: August 14, 1974
End Date: August 21, 1974
Accession Number
75A35559
Funding Number(s)
CONTRACT_GRANT: N00014-67-A-0103-0039
CONTRACT_GRANT: NSF GD-2252
CONTRACT_GRANT: NGR-48-002-154
CONTRACT_GRANT: NSF GA-43115X
CONTRACT_GRANT: NSF GA-487
Distribution Limits
Public
Copyright
Other

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