Coronal changes associated with a disappearing filament

Details Coronal changes associated with a disappearing filament Coronal changes associated with a disappearing filament

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...45..377s&link_type=abstract

Solar Physics, vol. 45, Dec. 1975, p. 377-392.

Astronomy and Astrophysics

Astronomy

100

Solar Corona, Solar Prominences, Solar Spectra, Solar X-Rays, X Ray Astronomy, Apollo Telescope Mount, H Lines, Magnetic Signatures, Microwave Emission, Skylab Program

Scientific paper

Skylab/ATM observations of a disappearing filament near the center of the solar disk are described using XUV and H-alpha spectroheliograms, X-ray filterheliograms, and photospheric magnetograms. The temperature of the coronal plasma as the filament disappeared is estimated to have been in excess of 6 million K, and it is noted that the time history of the soft X-ray and microwave fluxes displayed the gradual-rise-and-fall (GRF) signature, suggesting that the present event may have properties that are characteristic of a wide class of long-duration X-ray and radio events. A comparison with other spatially resolved long-duration X-ray events indicates that all such long-lived bursts involve transients in the outer corona and that some two-thirds of them involve either the eruption or the major activation of a prominence. It is also found that long-lived events are characterized by the appearance of new emission loops in the lower corona during the declining phase of the X-ray emission and that these loops sometimes disappear after the X-ray events and sometimes remain indefinitely.

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