Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..286m&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 286-290.
Astronomy and Astrophysics
Astrophysics
54
Far Ultraviolet Radiation, H Alpha Line, Solar Flares, Solar X-Rays, Spectroheliographs, Spicules, Filtergrams, Solar Radiation
Scientific paper
The paper presents observational evidence that two newly observed transient solar phenomena, EUV macrospicules and X-ray bright-point flares, are closely related. Time-lapse H-alpha filtergram observations of the limb in quiet regions show small surgelike eruptions called H-alpha macrospicules. From the similarity of H-alpha macrospicules and EUV macrospicules, and from comparison of simultaneous H-alpha and He II 304 A observations, we conclude that H-alpha macrospicules are EUV macrospicules viewed in H-alpha, although most EUV macrospicules are too faint in H-alpha to appear on H-alpha filtergrams of normal exposure. From comparison of simultaneous X-ray and H-alpha observations of flares in X-ray bright points situated on the limb, we show that flares in X-ray bright points often produce H-alpha macrospicules.
Bohlin David J.
Golub Leon
Moore Robert L.
Tang Fukun
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