Bursts of Explosive Events in the Solar Network

Observations of the quiet-Sun network in the UV emission line Siiv 1393 Å over a time period of two hours are presented. Bursts of explosive events, highly Doppler-shifted emission, seem to be sporadically emitted from the brighter regions of the network lanes. Individual events have typical lifetimes of ≈ 1–6 min and come in bursts of up to 30 min. The most spectacular burst in this dataset, shown in the accompanying movie, lasts ≈ 30 min and shows a wide variety of line profiles with both red and blue shifts ≈180 km s1. There appears to be no characteristic form or evolutionary pattern to the line profiles in either the individual events or series of events. There are about twice as many blue shifts as red shifts.

[1]  G. Brueckner,et al.  High-resolution telescope and spectrograph observations of the quiet solar chromosphere and transition zone , 1984 .

[2]  G. Rüdiger.  J. L. LINSKY and R. E. STENCEL (eds): Cool Stars, Stellar System, and the Sun. Proceedings of the Fifth Cambridge Workshop held in Boulder, Colorado, July 1987, Lecture Notes in Physics, Vol. 291, Springer-Verlag, 537 Seiten, Preis DM 92,— , 1989 .

[3]  S. Martin,et al.  The Cancellation of Magnetic Flux. I. On the Quiet Sun , 1985 .

[4]  Donald M. Hassler,et al.  SUMER - Solar Ultraviolet Measurements of Emitted Radiation , 1995 .

[5]  M. Benton.  Mass extinction among non-marine tetrapods , 1985, Nature.

[6]  J.-D. F. Bartoe,et al.  Outflows and Ejections in the Solar Transition Zone , 1986 .

[7]  K. Dere,et al.  Explosive events, magnetic reconnection, and coronal heating , 1994 .

[8]  Guenter E. Brueckner,et al.  Explosive events and magnetic reconnection in the solar atmosphere , 1991 .

[9]  W. Neupert,et al.  EIT: Extreme-ultraviolet Imaging Telescope for the SOHO mission , 1995 .

[10]  J. G. Timothy,et al.  FIRST RESULTS OF THE SUMER TELESCOPE AND SPECTROMETER ON SOHO – II. Imagery and Data Management , 1997 .

[11]  J.-D. F. Bartoe,et al.  Explosive events in the solar transition zone , 1989 .

[12]  W. I. Axford,et al.  Bi-directional plasma jets produced by magnetic reconnection on the Sun , 1997, Nature.

[13]  K. Dere,et al.  The magnetic network location of explosive events observed in the solar transition region , 1991 .

[14]  Donald M. Hassler,et al.  First results of the SUMER telescope and spectrometer-solar ultraviolet measurements of emitted radiation-on SOHO, I. Spectra and Spectroradiometry , 1997 .

[15]  M. J. Rycroft,et al.  Solar Wind Seven: E. Marsch and R. Schwenn (eds), 1992, 711 pp. Pergamon Press, £95.00 hb, ISBN 0-08-042049-4 , 1993 .

[16]  J.-D. F. Bartoe,et al.  Observations of high-energy jets in the corona above the quiet sun, the heating of the corona, and the acceleration of the solar wind , 1983 .