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September 7 1973 Two-Ribbon Flare

Published online by Cambridge University Press:  27 September 2017

J.G. Doyle
Affiliation:
Armagh Observatory, Armagh, BT61 9DG, N. Ireland
K.G. Widing
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington D.C., 20375 U.S.A.

Abstract

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The flare images show a compact, nearly cylindrical arcade centered along the filament channel and composed of 4 prominent loops. The loop systems of Fe XII (Te = 1.7 106K) and Fe XIV (Te = 2.3 106K) are smaller than, and lie nested within, the arcades of Fe XVI (Te = 3 106K) and Ca XVII (Te = 5 106K). The loop arcades at different temperatures, as well as different loops within a given arcade, show different expansion rates. These vary from 6 – 8 km s–1 for Fe XIV shortly after flare maximum to 0.5 – 1 km s–1 late in the decay phase. For hotter ions, such as Ca XVII, the velocities are approximately constant at 2 – 3 km s–1 daring the whole of the observations.

Type
Session II: Solar Flares
Copyright
Copyright © Kluwer 1989