The limb flare of May 8, 1951.

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The limb flare of May 8, 1951. Dodson, Helen W. Abstract interesting because many investigators consider flares to be essentially low-level phenomena. Hot spectroheliograms and spectra taken at the McMath-Hulbert Observatory on May 8, 1951 show the development of an extraordinarily bright limb object whose occurrence coincided with the onset and duration of a sudden ionospheric disturbance. The flare-like prominence reached a maximum intensity of four times that of the undisturbed Hot disk, an intensity which is comparable to that of some of the most important disk flares. Cornell records show 200 MC solar noise disturbances at the times of onset and maximum of this flare-like prominence. During the first minute of the activity the brilliant prominence rose with a velocity of the order of 700 km/sec and reached a height of 6o,ooo km. Hot spectra taken during this period show Doppler shifts indicating motion tangential to the sun's surface greater than 300 km/sec. Hot was 8A to IoA wide. It is believed that this flare-like prominence was associated with the very large spot group still behind the east limb. The lowest levels of the solar region associated with the flare were in all probability occulted by the sun itself. McMath-Hulbert Observatory, University of Michigan, Pontiac, Mich. Publication: The Astronomical Journal Pub Date: October 1951 DOI: 10.1086/106545 Bibcode: 1951AJ.....56..124D full text sources ADS |