Volume 9 Issue 1
Jan.  1989
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Suo Yu-chang, Li Yong-sheng, Wei Min-jun. There is Seasonal Abnormal Phenomenon in Night Time f0F2[J]. Chinese Journal of Space Science, 1989, 9(1): 64-69. doi: 10.11728/cjss1989.01.064
Citation: Suo Yu-chang, Li Yong-sheng, Wei Min-jun. There is Seasonal Abnormal Phenomenon in Night Time f0F2[J]. Chinese Journal of Space Science, 1989, 9(1): 64-69. doi: 10.11728/cjss1989.01.064

There is Seasonal Abnormal Phenomenon in Night Time f0F2

doi: 10.11728/cjss1989.01.064 cstr: 32142.14.cjss1989.01.064
  • Received Date: 1987-12-23
  • Rev Recd Date: 1900-01-01
  • Publish Date: 1989-01-24
  • Using data of nine ionospheric stations of China during Dec., 1975-Dec., 1986, it is presented that under the conditions of certain latitudes and solar activity, night time f0F2 shows a seasonal anomaly similar to that of the daytime foFz. This anomaly obviously shows two features: it only occurs in low latitudes; the higher solar activity is, the larger exlent of the degree of the anomaly is to. The night time seasonal abnormal phenomenon is the continuation of daytime seasonal abnormal phenomenon. The promary mechanism of the phenomenon is the seasonal variation of neutral air (O, O2, N2) concentration ratio O/O2 and O/N2, caused by the summer hemispher to winter hemisphere air flow. It is analysed why the night time seasonal abnormal phenomenon is limited in low latitudes and why the abnormal degree changes with solar activity.

     

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