Proposal ID Hanaoka_273

Date of Proposal Feb 2 2003

firstname

Yoichiro

lastname

Hanaoka

institute

National Astronomical Observatory of Japan

address

2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

email

hanaoka@solar.mtk.nao.ac.jp

phone

+81-422-34-3703

fax

+81-422-34-3742

proposal

We measured linear polarization and Doppler velocity of the kernels of a gradual flare (C5.8) occurred on 2002 October 14 in the H-alpha line. The polarization of which the degree exceeds 1 % was detected, and this fact implies that a proton beam bombarded the chromosphere, and produced impact polarization in the H-alpha line. The RHESSI observation shows that the hard X-ray spectrum of this flare has no power-law component. Therefore, the proton beam is possibly the principal heating agent in this flare, which produced hot plasma observed in soft X-rays. The EIT of SOHO also observed this flare, and it shows the development of the flare, from the very beginning of the flare to the post-flare-loop phase.

inside_collab

None

consortium

no

topic

Flares

topic

title

H-alpha Impact Polarization in a Gradual Flare

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