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Title: Some Studies on Solar Optical Flares Reported under New Classification
Authors: Mitra, R. K.
Sarkar, S. K.
Gupta, M. K. Das
Issue Date: Jun-1972
Publisher: NISCAIR-CSIR, India
Abstract: Solar optical flares, numbering 8230, reported during the period September 1967 to November 1969, which covers the peak phase of the current solar cycle, were examined in relation to (1) percentage occurrences under different classes, (2) position on the solar disk, (3) rise-time and duration, and (4) associated visual indications, numbering 26. From the study of the relative percentage occurrences of flares, it has been found that maximum occurrences under different classifications are as follows: 58% normal (n), 82% subflares (8), and 47% dual importance (Sn). Percentage occurrences of flares under classes 2 and 3 increase with higher order of the intensity range and class 3 flares appear to be mostly bright. Regarding the distribution of flares on the solar disk, a strong north-south asymmetry (over 60% occurring in the northern hemisphere) exists for all classes of flares. East-west asymmetry is, however, negligible. Bright flares (b) are found to be inherently more impulsive in nature and the explosive phase (V) is mostly associated with these. Percentages of flares having some form of visual indications increase with increasing importance. Brilliant points (D and E), high velocity dark surges (H), and eruptive centres (F) are found to be relatively more important in all classes of flares.
Page(s): 170-174
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.01(2) [June 1972]

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