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

Abstract

view Abstract Citations (30) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS First Observations of Macrospicules at 4.8 GHz at the Solar Limb in Polar Coronal Holes Habbal, Shadia R. ; Gonzalez, Raymond D. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1991 DOI: 10.1086/186094 Bibcode: 1991ApJ...376L..25H Keywords: Coronal Holes; Polar Regions; Solar Corona; Solar Limb; Solar Radio Emission; Spicules; Brightness Temperature; Radio Astronomy; Very Large Array (Vla); Solar Physics; SUN: CORONA; SUN: RADIO RADIATION full text sources ADS |