First observations of microspicules at 4.8 GHz at the solar limb in polar coronal holes

Details First observations of microspicules at 4.8 GHz at the solar limb in polar coronal holes First observations of microspicules at 4.8 GHz at the solar limb in polar coronal holes

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376l..25h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 376, July 20, 1991, p. L25-L27. Smithsonian Institution-supported

Astronomy and Astrophysics

Astronomy

18

Coronal Holes, Polar Regions, Solar Corona, Solar Limb, Solar Radio Emission, Spicules, Brightness Temperature, Radio Astronomy, Very Large Array (Vla)

Scientific paper

VLA observations at 4.8, 8.5, and 15 GHz have led to the detection of macrospicules in solar coronal holes. The limb was sharply defined at all three frequencies. The brightness temperatures obtained for the macrospicules lead to an empirical model in which a cool 8000-K core is surrounded by a thin, hotter sheath of 100,000-200,000 K; these features are virtually identical to those derived from EUV observations over 10 years ago. A pinching-off and ballooning is noted at the top of the macrospicules' magnetic structure which may lead to the escape of some of the plasma from the macrospicules' locations.

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