MICROBURST PHENOMENA. I. AURORAL ZONE X-RAYS

High-time resolution x-ray equipment flown from Ft. Churchill, Manitoba, Canada on August 11, 1965 provides evidence for species of auroral zone x-ray microbursts with an asymmetric time profile. These asymmetric microbursts are characterized by a rise of the form 1 - e to the power (-t/tau sub R) w...

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Bibliographic Details
Main Authors: Oliven,N. M., Venkatesan,D., Edwards,P. J., McCracken,K. G., Steinbock,M.
Other Authors: IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY
Format: Text
Language:English
Published: 1967
Subjects:
Atmospheric Physics
(*X RAYS
POLAR REGIONS)
CANADA
BREMSSTRAHLUNG
BALLOONS
ATMOSPHERIC SOUNDING
UPPER ATMOSPHERE
ELECTRONS
GEOMAGNETISM
AURORAE
RADIATION MEASURING INSTRUMENTS
MAGNETOSPHERE
Canada
Churchill
Online Access:http://www.dtic.mil/docs/citations/AD0660196
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0660196
Description
Summary:High-time resolution x-ray equipment flown from Ft. Churchill, Manitoba, Canada on August 11, 1965 provides evidence for species of auroral zone x-ray microbursts with an asymmetric time profile. These asymmetric microbursts are characterized by a rise of the form 1 - e to the power (-t/tau sub R) where tau sub R is about 30 milliseconds, and a decay of the form of e to the power (-t/tau sub D) where tau sub D is about 200 milliseconds, and a typical peak flux for the largest events of Jo (Ex-ray > 60 keV) of about 100 photons/cm squared sec at 10 g/sq. cm. An episode of these asymmetric bursts was observed in the early morning hours (after 4:30 local time) and an episode of the more common symmetric microbursts began after 9:30 local time. The fast rise times, and the lack of dispersion approximately = or > 10 milliseconds in the x-ray bursts observed at different energies implies restrictions on the nature, and propagation of the parent electron microbursts. (Author) Prepared in cooperation with Calgary Univ. (Alberta), and Southwest Center for Advanced STUDIES( Dallas, Tex., Contract NASr-198.

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