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Chinese Journal of Space Science ›› 2016, Vol. 36 ›› Issue (1): 12-17.doi: 10.11728/cjss2016.01.012

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Analysis of the Properties of Solar Active Regions and the Solar Flares during 1996—2008ormalsize

LU Yangping1,2, ZHAO Haofeng1, LE Guiming2, YIN Zhiqiang3, CHEN Minhao1,2, LI Zhongyi1,2   

  1. 1. Nanjing University of Information Science and Technology, Nanjing 210044;
    2. Key laboratory of Space Weather, National Center Space Weather, China Meteorological Administration, Beijing 100081;
    3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
  • Received:2015-06-17 Revised:2015-09-12 Online:2016-01-15 Published:2016-01-06

Abstract:

The total number of solar Active Regions (AR) Nt that occurred during 1996—2008 is 3067. And 58.52% of the Nt are the AR with the area satisfying the condition 10μh ≤ S≤90μh, 31.43% of the Nt are the AR with the area satisfying the condition 100μh ≤ S≤490μh. The AR with area S≥500μh only accounted for about 6% and the ARs with area S≥1000μh only accounted for about 1% of the total AR. The AR with area being 0 accounted for 4.01%. For each year during 1996—2008, the ratio of AR with different area S to the total number of AR usually reached its maximum at the time several years after solar maximum except the AR with area S≤ 50μh. The number that can produce at least one solar X-ray flare during 1997—2008 is 1408. The total number of C-class flares is 7706, while the total number of M-class flare is 1141 and the total number of X-class flare is 110 during 1997—2008. The sum of time integral of X-ray flux in 1~8Å produced by all C-class, M-class and X-class flares are 22.711, 29.443 and 36.178 J·m-2. The Soft X-Ray (SXR) flare activities in the southern hemisphere are stronger that in the northern hemisphere during Solar Cycle 23.

Key words: Sunspot, Solar flare, Solar active regions

CLC Number: