講演情報
[PEM09-P05]RELATIONSHIP OF F LAYER HEIGHT RISE, ESF ONSET TIME, AND AMPLITUDE OF LARGE SCALE WAVE STRUCTURE
*Dyah Rahayu Martiningrum1、Mamoru Yamamoto2、Tatsuhiro Yokoyama3、Prayitno Abadi4、Pornchai Supnithi5、Minh Le Huy6 (1.Graduate School of Informatics, Kyoto University、2.Research Institute for Sustainable Humanosphere, Kyoto University、3.National Institute of Informatics and Communications Technology (NICT), Tokyo、4.Solar-Terrestrial Environment Laboratory (STEL), Nagoya University、5.Faculty of Engineering King Mongkut's Institute of Technology, Ladkrabang, Thailand、6.Institute of Geophysics Vietnamese Academy of Science and Technology, Vietnam)
キーワード：
F layer height rise、Large Scale Wave Structure、onset time of Equatorial Spread F
Under favourable conditions ionospheric plasma at the bottomside of the F-region can become unstable. Plasma irregularities in several scales produced by Rayleigh-Taylor Instability mechanism. The recombination process at the E-region after sunset causing the bottom side F-region electron density gradient become steep. At the same time the eastward electric field intensified just before it reverses to the westward electric field causing the peak of the F region rise known as evening prereversal enhancement. The relationship between onset time of field aligned irregularities related to ESF observed by Equatorial Atmosphere Radar during 2010-2012 with F layer height rise observed by ionosondes near geomagnetic equator, Chumphon (10.7 N; 99.4 E; 0.86 N) and Bac Lieu (9.3 N; 105.7 E; 0.62 N) is discussed in correspondence with growth rate of Rayleigh Taylor instability development. The field aligned irregularities onset time associated with equatorial spread F observed into two different cases, first case where the EPB/ESF onset time concurrent with the peak of virtual height of F region - (h’F) time. Second case where the EPB/ESF onset time happened with delay of more than 30 minutes, with reference to the peak of virtual height of F region - (h’F) time. The possibility that the amplitude of Large Scale Wave Structure obtained from GRBR data effects the height of plasma instability development also discussed.