@inproceedings{oai:jaxa.repo.nii.ac.jp:00005001,
 author = {遠藤, 輝 and 守上, 浩市 and 田代, 信 and 寺田, 幸功 and 山岡, 和貴 and 園田, 絵里 and 簑島, 敬 and Endo, Akira and Morigami, Kouichi and Tashiro, Makoto and Terada, Yukikatsu and Yamaoka, Kazutaka and Sonoda, Eri and Minoshima, Takashi and Krucker, Sam and HXD-WAM team},
 book = {宇宙航空研究開発機構特別資料:, JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H},
 month = {Feb},
 note = {The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan, Results of solar flare observations in the hard X-ray band with the Suzaku Wide-band All-sky Monitor (WAM) are reported. On June 2009, 108 solar flares (GOES class X:16, M:29, C:46, B:17) have been detected with the WAM since the launch. One of the brightest flares WAM detected was the event occurring on 2006 December 13. It lasted for more than 700 seconds even in above 500 keV. This event was simultaneously observed by the solar missions Hinode and RHESSI in soft and hard X-ray region respectively, and by Nobeyama Radio Observatory in radio. Thanks to the large effective area up to 800 cm2 of the WAM, we were able to study 1-sec variations of the hardness of this flare and find the Soft-Hard-Harder phenomena in the hard X-ray emission. This feature is similar to the previous reports on the footpoint emission of the flare loop by Minoshima et al. (2009) using RHESSI especially in the high energy region (above 200 keV), hardness ratio kept hardening after the maxima of the flux. In addition to that detailed study, we performed systematic studies on 21 solar flares detected with the WAM. Among these 21 flares, 7 events showed Soft-Hard-Soft behavior, 9 events showed Soft-Hard-Harder behavior, and rest 5 showed consistent with being flat hardness., Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science, 資料番号: AA0064574069, レポート番号: JAXA-SP-09-008E},
 pages = {194--195},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Time-resolved hard X-Ray hardness variation of solar flares observed by Suzaku Wide-band All-sky monitor},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}