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Measurement of the Increase in Altitute of the Soft X-Ray Emission Regions of Solar Flares

Published online by Cambridge University Press:  12 April 2016

J.F. Seely  and
U. Feldman
J.F. Seely
Affiliation:
E.O. Hulburt Center for Space Research Naval Research Laboratory Washington, DC 20375-5000
U. Feldman
Affiliation:
E.O. Hulburt Center for Space Research Naval Research Laboratory Washington, DC 20375-5000

Extract

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The upward motion of the hot thermal regions of several large (M type) solar flares have been determined from the soft X-ray spectral data recorded by the scanning spectrometer (SOLFLEX) on the P78-1 spacecraft. The change in position of the emission is measured with a spatial resolution of 2000 km and a temporal resolution of 58 sec. For the limb flares that are studied, the centroid of the Ca XIX emission region moves to a higher altitude with a speed of 20 to 40 km/sec for a period of 20 to 30 minutes following onset of the flare and reaches an altitude of 30,000 to 40,000 km. The speed of ascent decreases with time, and in several flares that are studied, there is an indication that the centroids of the Ca XIX emission oscillate in altitude with amplitudes of 5,000 to 10,000 km and with periods of 5 to 8 minutes.

Type
Session 1. Solar Astrophysics
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 12
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.