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Observations of energetic X-rays from quiescent solar active regions∗

Published online by Cambridge University Press:  14 August 2015

Loren W. Acton  and
Philip C. Fisher
Loren W. Acton
Affiliation:
Lockheed Palo Alto Research Laboratory, Palo Alto, Calif., U.S.A.
Philip C. Fisher
Affiliation:
Lockheed Palo Alto Research Laboratory, Palo Alto, Calif., U.S.A.

Abstract

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A measurement of the solar X-ray spectrum in the 1–30 KeV interval was made by rocket-borne instruments at 0015 UT on April 5, 1967. These measurements show that the solar X-ray spectrum, which falls off steeply with energy below 4 KeV, becomes less steep above this energy. These data are taken to indicate that energetic, non-thermal, electrons are present or continuously produced in quiescent solar active regions. No optical flare activity was reported for several hours around the time of these observations.

Type
Part V: Coronal and Interplanetary Structure of an Active Region
Information
Symposium - International Astronomical Union , Volume 35: Structure and Development of Solar Active Regions , 1968 , pp. 432 - 438
Copyright
Copyright © Reidel 1968 

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