期刊
ASTROPHYSICAL JOURNAL
卷 536, 期 2, 页码 L109-L112出版社
UNIV CHICAGO PRESS
DOI: 10.1086/312739
关键词
MHD; Sun : activity; Sun : corona; Sun : flares; X-rays
It was recently pointed out that the distribution of times between solar flares (the flare waiting-time distribution) follows a power law for long waiting times. Based on 25 years of soft X-ray flares observed by Geostationary Operational Environmental Satellite instruments, it is shown that (1) the waiting-time distribution of flares is consistent with a time-dependent Poisson process and (2) the fraction of time the Sun spends with different flaring rates approximately follows an exponential distribution. The second result is a new phenomenological law for flares. It is shown analytically how the observed power-law behavior of the waiting times originates in the exponential distribution of flaring rates. These results are argued to be consistent with a nonstationary avalanche model for flares.
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