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Chinese Science Bulletin

, Volume 46, Issue 5, pp 369–372 | Cite as

Absorption events associated with solar flares

  • Longsong He
  • M. Nishino
  • Beichen Zhang
  • Ruiyuan Liu
  • Yonghua Liu
  • Shunlin Liu
  • Hongqiao Hu
  • N. Sato
  • H. Yamagishi
Notes

Abstract

During the upward period of solar cycle 23, the Imaging Riometer at Zhongshan, Antarctica (geomag. lat. 74.5 S) was used to study the solar proton events and the Xray solar flares which are associated with the absorption events. In our study, the relationship between the absorption intensity and X-ray flux is found in a power form which is consistent with the theoretical result. The imaging riometer absorption data at Ny-Ålesund, Svalbard reconfirm the above relationship. We also argue that only M-class flares can generate a significant daytime absorption.

Keyword

Imaging Riometer X-ray flare solar proton event ionospheric absorption 

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References

  1. 1.
    Stauning, P., Investigations of ionospheric radio wave absorption processes using imaging riometer techniques, J. Atmosphy. Terr. Phys., 1996, 58: 753.CrossRefGoogle Scholar
  2. 2.
    Ranta, H., Ranta, A., Yousef, S. M. et al., D-region observations of polar cap absorption events during EISCAT operation in 1981 1989, J. Atmosphy. Terr. Phys., 1993, 55: 751.CrossRefGoogle Scholar
  3. 3.
    Detrick, D. L., Rosenberg, T. J., A phase-array radiowave imager for studies of cosmic noise absorption, Radio Sci., 1990, 25: 325.CrossRefGoogle Scholar
  4. 4.
    Rosenberg, T. J., Detrick, D. L., Venkatesan, D. et al., A comparative study of imaging and broad-beam riometer measurements: The effects of spatial structure on the frequency dependence of aurora absorption, J. Geophys. Res., 1991, 96: 17, 793.CrossRefGoogle Scholar
  5. 5.
    Liu, Y., Liu, R., He, L. et al., Preliminary result of imaging riometer at Zhongshan Station, Antarctica, Chinese Journal of Polar Science, 1999, 10(1): 33.Google Scholar
  6. 6.
    Brekke, A., Physics of the Upper Polar Atmosphere, Chichester: John Wiley & Sons, 1997, 233Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Longsong He
    • 1
    • 4
  • M. Nishino
    • 2
  • Beichen Zhang
    • 1
  • Ruiyuan Liu
    • 1
  • Yonghua Liu
    • 1
  • Shunlin Liu
    • 1
  • Hongqiao Hu
    • 1
  • N. Sato
    • 3
  • H. Yamagishi
    • 3
  1. 1.Polar Research Institute of ChinaShanghaiChina
  2. 2.STE LaboratoryNagoya UniversityToyokawaJapan
  3. 3.National Institute of Polar ResearchTokyoJapan
  4. 4.Department of PhysicsLa Trobe UniversityBundooraAustralia

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