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Chinese Journal of Space Science ›› 2013, Vol. 33 ›› Issue (5): 501-508.doi: 10.11728/cjss2013.05.501

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Tidelike Periodicities of Ionospheric Sporadic E Observed at Low Latitude Hainan Station

Wang Guojun, Shi Jiankui, Wang Xiao   

  1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190
  • Received:2012-11-20 Revised:2013-05-14 Online:2013-09-25 Published:2013-08-21

Abstract:

The time series of the ionospheric Sporadic E (Es) critical frequency (f0Es) and its virtual height (h'Es) were performed on a large database of DPS-4 ionograms recorded at Hainan station (19.5°N, 109.1°E) in 2004 to investigate the features of tidelike periodicity variations in low latitude. On yearly spectra, there was pronounced 8-hour periodicity in low latitude Es in addition to the well known 24-and 12-hour tidal variations. The yearly average phases of 24-, 12-, and 8-hour periodicities for f0Es (h'Es) were at 13:00LT (13:00LT), 11:00LT (09:00LT), and 09:30LT (09:30LT). On every two-month spectra, the results showed that (1) the 24-hour periodicity in Es was the most pronounced in each season; (2) The 12-hour periodicity in Es was outstanding in each season except in January-February months; (3) The 8-hour periodicity was remarkable in equinoxes and July-August months for f0Es, and it was notable in almost each season for h'Es; (4) The 6-hour periodicity mainly occurred in November and December for f0Es, whereas for h'Es it appeared more in summer and winter, and weakly in equinox months. It is clearly distinct from previous results by the fact that the 6-and 8-hour periodicities in Es layer at Hainan station can occur in winter or other seasons. The 6-and 8-hour periodicities in Es layer most probably are caused by the quarter-diurnal and terdiurnal tide components, which needs to be investigated further by combining the observations and modeling of local tide.

Key words: Low latitude ionosphere, Sporadic E, Periodicity variation, Tide

CLC Number: