Abstract
The Yohkoh Soft X-Ray Telescope (SXT) has been revealing the coronal characteristics of a microflaring phenomenon in X-rays: Microflares are observed as transient brightenings of compact coronal loops (Shimizu et al., 1992); they appear mainly in form of multiple or single loops, although they are sometimes point-like (Shimizu et al., 1994). They recur frequently in two localized areas of active regions, namely, in growing emerging magnetic flux regions and around the outer edge of the penumbra of well-developed large spots (Shimizu, 1993). The sum of transient brightenings does not make much contribution to the heating of the active-region corona, although they occur very numerously in active regions (Shimizu, 1995a).
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References
Shimizu, T., Tsuneta, S., Acton, L. W., Lemen, J. R. and Uchida, Y. (1992) Transient Brightenings in Active Regions Observed by the Soft X-Ray Telescope on Yohkoh, Publ. Astron. Soc. Japan, 44, L147–153.
Shimizu, T. (1993) Active-Region Transient Brightenings in NOAA 7260, in T. Sakurai et al. (eds.), Proceedings of the 2nd Japan-China Seminar on Solar Physics, National Astronomical Observatory of Japan, Tokyo, pp. 193–196.
Shimizu, T., Tsuneta, S., Acton, L. W., Lemen, J. R., Ogawara, Y. and Uchida, Y. (1994) Morphology of Active Region Transient Brightenings with the Yohkoh Soft X-Ray Telescope, Astrophys. J., 422, 906–911.
Shimizu, T. (1995a) Energetics and Occurrence Rate of Active-Region Transient Brightenings and Implications for the Heating of the Active Region Corona, Publ. Astron. Soc. Japan, 47, 251–263.
Shimizu, T. (1995b) Studies of Transient Brightenings (Microflares) Discovered in Solar Active Regions, PhD thesis, University of Tokyo
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© 1996 Kluwer Academic Publishers
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Shimizu, T., Tsuneta, S., Title, A., Tarbell, T., Shine, R., Frank, Z. (1996). Heating of Active Region Corona by Transient Brightenings (Microflares). In: Uchida, Y., Kosugi, T., Hudson, H.S. (eds) Magnetodynamic Phenomena in the Solar Atmosphere. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0315-9_5
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DOI: https://doi.org/10.1007/978-94-009-0315-9_5
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