Volume 29 Issue 4
Jul.  2009
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Ma Ruiping, Xu Jiyao, Yuan Wei, Jiang Guoying, Liu Xiao. Quasi-27-Day Variations of Ionospheric NmF2[J]. Journal of Space Science, 2009, 29(4): 368-376. doi: 10.11728/cjss2009.04.368
Citation: Ma Ruiping, Xu Jiyao, Yuan Wei, Jiang Guoying, Liu Xiao. Quasi-27-Day Variations of Ionospheric NmF2[J]. Journal of Space Science, 2009, 29(4): 368-376. doi: 10.11728/cjss2009.04.368

Quasi-27-Day Variations of Ionospheric NmF2

doi: 10.11728/cjss2009.04.368
  • Received Date: 1900-01-01
  • Rev Recd Date: 1900-01-01
  • Publish Date: 2009-07-15
  • The data observed at 11 ionosonde stations in the East Asia/Australia sector during 1969---1980 and the band-pass filter method have been used to analyze the characteristics of the quasi-27-day variations of daytime NmF2 and the relativity between NmF2 and the solar activity index F10.7. The results are summarized as follows. In most years, the short period (2~70 days) spectra of F10.7 and NmF2 have obvious maxima around 27-day period. In the quasi-27-day variations, the standard deviations of F10.7 and NmF2 have evident variability year-to-year. The average standard deviation of F10.7 is 10.9\%. The standard deviations of NmF2 depend on geomagnetic latitude, the minima appear at equator and they become greater with increasing latitude. The average standard deviation of NmF2 of 11 stations is about 8.2%. In the quasi-27-day band, F10.7 and NmF2 have notable correlation. The probability of the significant correlation at 0.05 significance level exceeds 90%. The average time delay between variations of the NmF2 and F10.7 is about 2 days. As a whole, the quasi-27-day variations of NmF2 primarily attribute to the quasi-27-day variations of the solar EUV flux.

     

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