Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..854k&link_type=abstract
The Astrophysical Journal, vol. 428, no. 2, pt. 1, p. 854-859
Astronomy and Astrophysics
Astrophysics
15
Brightness Distribution, Coronal Holes, Fine Structure, Solar Limb, Solar Prominences, Sun, Ultraviolet Photography, Algorithms, Extreme Ultraviolet Radiation, Luminous Intensity, Skylab 1, Spectroheliographs
Scientific paper
The fine structure of the solar limb in coronal holes is explored at temperatures ranging from 104 to 106 K. An image enhancement algorithm orignally developed for solar eclipse observations is applied to a number of simultaneous multiwavelength observations made with the Harvard Extreme Ultraviolet Spectrometer experiment on Skylab. The enhanced images reveal the presence of filamentary structures above the limb with a characteristic separation of approximately 10 to 15 sec . Some of the structures extend from the solar limb into the corona to at least 4 min above the solar limb. The brightness of these structures changes as a function of height above the limb. The brightest emission is associated with spiculelike structures in the proximity of the limb. The emission characteristic of high-temperature plasma is not cospatial with the emission at lower temperatures, indicating the presence of different temperature plasmas in the field of view.
Blundell Solon F.
Karovska Magarita
Rifai Habbal Shadia
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