Effects of pre-reversal enhancement of E?×?B drift on the latitudinal extension of plasma bubble in Southeast Asia

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• 作者：Prayitno Abadi ; Yuichi Otsuka ; Takuya Tsugawa
• 关键词：Equatorial ionosphere ; Plasma bubble ; Pre ; reversal enhancement ; Scintillation
• 刊名：Earth, Planets and Space
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：67
• 期：1
• 全文大小：2033KB
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• 作者单位：Prayitno Abadi (1) (2)
  Yuichi Otsuka (2)
  Takuya Tsugawa (3)
  
  1. Space Science Center, the Indonesian National Institute of Aeronautics and Space (LAPAN), Bandung, Jawa Barat, Indonesia
  2. Solar-Terrestrial Environment Laboratory (STEL), Nagoya University, Nagoya, Aichi, Japan
  3. National Institute of Information and Communications Technology (NICT), Koganei, Tokyo, Japan
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

We investigated the effects of the F region bottomside altitude (h’F), maximum upward E?×?B drift velocity, duration of pre-reversal enhancement and the integral of upward E?×?B drift on the latitudinal extension of equatorial plasma bubbles in the Southeast Asian sector using the observations recorded by three GPS receivers and two ionosondes. The GPS receivers are installed at Kototabang (0.2°S, 100.3°E; 9.9°S magnetic latitude), Pontianak (0.02°S, 109.3°E; 9.8°S magnetic latitude) and Bandung (6.9°S, 107.6°E; 16.7°S magnetic latitude) in Indonesia. The ionosondes are installed at magnetically equatorial stations, Chumphon (10.7°N, 99.4°E; 0.86°N magnetic latitude) in Thailand and Bac Lieu (9.3°N, 105.7°E; 0.62°N magnetic latitude) in Vietnam. We analysed those observations acquired in the equinoctial months (March, April, September and October) in 2010-012, when the solar activity index F _10.7 was in the range from 75 to 150. Assuming that plasma bubbles are the major source of scintillations, the latitudinal extension of the bubbles was determined according to the S4 index. We have found that the peak of h’F, maximum upward E?×?B drift and the integral of upward E?×?B drift during the pre-reversal enhancement period are positively correlated with the maximum latitude extension of plasma bubbles, but that duration of pre-reversal enhancement does not show correlation. The plasma bubbles reached magnetic latitudes of 10°-0° in the following conditions: (1) the peak value of h’F is greater than 250-50 km, (2) the maximum upward E?×?B drift is greater than 10-0 m/s and (3) the integral of upward E?×?B drift is greater than 50-50 m/s. These results suggest that the latitudinal extension of plasma bubbles is controlled mainly by the magnitude of pre-reversal enhancement and the peak value of h’F at the initial phase of development of plasma bubbles (or equatorial spread F) rather than by the duration of pre-reversal enhancement. Keywords Equatorial ionosphere Plasma bubble Pre-reversal enhancement Scintillation