Extreme-ultraviolet transients observed at the solar pole

Abstract

view Abstract Citations (65) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Extreme-ultraviolet transients observed at the solar pole. Withbroe, G. L. ; Jaffe, D. T. ; Foukal, P. V. ; Huber, M. C. E. ; Noyes, R. W. ; Reeves, E. M. ; Schmahl, E. J. ; Timothy, J. G. ; Vernazza, J. E. Abstract Extreme-ultraviolet (EUV) observations of two polar transient features ('macrospicules') are described. These features appear to be caused by jets of chromospheric material that shoot upward to a height of 35,000 km above the limb and then fall back into the chromosphere, reaching terminal velocities of about 140 km/s. On the basis of a model developed from the EUV measurements, it is found that the energy required to produce each event is about 3 by 10 to the 26th power ergs, about two orders of magnitude more than that required to produce an ordinary spicule. This indicates that macrospicules may be an important factor in the energy balance of the chromosphere and corona. Publication: The Astrophysical Journal Pub Date: January 1976 DOI: 10.1086/154108 Bibcode: 1976ApJ...203..528W Keywords: Chromosphere; Far Ultraviolet Radiation; Polar Regions; Spectroheliographs; Spicules; Continuous Spectra; Lyman Alpha Radiation; Skylab Program; Solar Corona; Solar Flux; Solar Limb; Surges; Solar Physics full text sources ADS |