Flares and MHD Jets in Protostar

Hayashi, Mitsuru; Shibata, Kazunari; Matsumoto, Ryoji

doi:10.1007/978-94-011-4970-9_61

Mitsuru Hayashi⁴,
Kazunari Shibata⁵ &
Ryoji Matsumoto⁶

Part of the book series: International Astronomical Union / Union Astronomique Internationale ((IAUS,volume 188))

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Abstract

By using ASCA, Koyama et al. (1994, 1996) carried out a systematic survey of hard X-ray sources in molecular clouds and revealed that protostars are strong hard X-ray emitting sources. Some of them show flare-like activities. Protostellar flares differ from solar flares in their total energy (10^35-36 erg), size( several times the radius of protostar), and higher temperature(8keV). Protostellar flares are also observed in lower energy band by ROSAT in YLW15 (Grosso et al. 1997). By extending the model of solar flares associated with footpoint shearing motion, we proposed a model of protostellar flares in which the magnetic field connecting the protostar and the disk disrupt by twist injection from the rotating disk(Hayashi et al. 1996).

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References

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Authors and Affiliations

Japan Atomic Energy Research Institute(JAERI), 801 -1 Mukouyama, Naka-machi, Naka-gun, Ibaraki, 311-01, Japan
Mitsuru Hayashi
National Astronomical Observatory, Mitaka, Tokyo, 181, Japan
Kazunari Shibata
Department of Physics, Faculty of Science, Chiba University, Inage-Ku, Chiba, 263, Japan
Ryoji Matsumoto

Authors

Mitsuru Hayashi
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Kazunari Shibata
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Ryoji Matsumoto
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Editors and Affiliations

Kyoto University, Japan
Katsuji Koyama
Osaka University, Japan
Shunji Kitamoto
Kobe University, Japan
Masayuki Itoh

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Hayashi, M., Shibata, K., Matsumoto, R. (1998). Flares and MHD Jets in Protostar. In: Koyama, K., Kitamoto, S., Itoh, M. (eds) The Hot Universe. International Astronomical Union / Union Astronomique Internationale, vol 188. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4970-9_61

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DOI: https://doi.org/10.1007/978-94-011-4970-9_61
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-5059-0
Online ISBN: 978-94-011-4970-9
eBook Packages: Springer Book Archive

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