Accession Number:

ADA273596

Title:

Report for Contract N00014-91-J-1112 (Stanford University)

Descriptive Note:

Rept. for 1 Oct 1990-31 Sep 1993

Corporate Author:

STANFORD UNIV CA

Personal Author(s):

Report Date:

1993-09-30

Pagination or Media Count:

4.0

Abstract:

The aim of the research supported by the ONR contract has been to improve our understanding of factors leading to solar flares, with the long-term goal of improving predictions of these events. To achieve this goal, we have studied spatial and temporal patterns in solar flare occurrences. We have found that solar flares tend to occur in hot spots, which rotate rigidly Bai 1990. The two northern-hemisphere hot spots, which rotate with a synodic period of 26. 727 days 24.905 days in sidereal, persisted in the same locations during cycles 20 through 22. We have made extensive studies on quasi-periodic changes of flare occurrence rates. Occurrence rates of major flares, regardless of selection criteria, episodically show periodic variations

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE