Japan Geoscience Union Meeting 2016

Presentation information

International Session (Poster)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM09] Study of coupling processes in solar-terrestrial system

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University), Satonori Nozawa(Institute for Space-Earth Environment Research), Yasunobu Ogawa(National Institute of Polar Research), Hiroyuki Hashiguchi(Research Institute for Sustainable Humanosphere, Kyoto University), Akimasa Yoshikawa(Department of Earth and Planetary Sciences, Kyushu University)

5:15 PM - 6:30 PM


*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)

Keywords: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.