Japan Geoscience Union Meeting 2015

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

[P-EM25] Heliosphere and Interplanetary Space

Mon. May 25, 2015 11:00 AM - 12:45 PM 202 (2F)

Convener:*Munetoshi Tokumaru(Solar-Terrestrial Environment Laboratory, Nagoya University), Tomoko Nakagawa(Information and Communication Engineering, Tohoku Institute of Technology), Chair:Munetoshi Tokumaru(Solar-Terrestrial Environment Laboratory, Nagoya University)

11:30 AM - 11:45 AM

[PEM25-10] The souce region of solar wind in the photosphere

*Kazuyuki HAKAMADA1, Munetoshi TOKUMARU2, Ken'ichi FUJIKI2 (1.Chubu University, 2.Solar-Terrestrial Environment Laboratory)

Keywords:solar wind, photoshphere, source region, solar wind speed

In this paper, we calculate coronal magneti field expanding to the interplanetary space by the Radial-Field model (devised by Hakamada) with synoptic maps of photospheric magnetic data observed by the NSO/Kitt Peak, USA. We project solar wind speed distribution on the source surface observed by the STE-Lab of Nagoya University to the photosphere along the line of force in the coronal magnetic field. We found the following results; (1) around the maximum pase of solar activity cycle, slow speed solar winds emanate from very narrow string like areas surrounding closed magnetic regions in the photosphere which have extreemely high magnetic expansion rate, (2) in the other phases, bisides the maximum, high speed winds emanate from high latitudes of less magnetic expansion rate, except near the poles, and slow speed winds emanate from narrow belts of large magnetic expansion rate in low to middle latitudes extending the solar equator.