Accession Number : AD0686169

Title :   H-ALPHA PLAGE CONFIGURATION AS A PREDICTOR OF LARGE FLARES.

Descriptive Note : Final rept. 1-Jun-31 Dec 68,

Corporate Author : MANILA OBSERVATORY (PHILIPPINES)

Personal Author(s) : Miller,Richard A. ; Trinidad,Allan V.

Report Date : 31 JAN 1969

Pagination or Media Count : 20

Abstract : Pre and post flare H-alpha plage configurations for 132 major flares over a period of more than two years were examined. The records of H-alpha plage configurations at the Manila Observatory showed a predisposing visual indication of major flare activity was a gradual folding and sharpening of plage streamers into a roughly gamma or lambda shape. Major flares occurred within the accuracy of position measurements at the junction of these bright streamers. When these configurations softened into rounded shapes, the likelihood of a major flare in these areas for the interval studied, dwindled to zero. (Author)

Descriptors :   (*SOLAR FLARES, PREDICTIONS), HYDROGEN, LINE SPECTRA, PHILIPPINES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE