Active region EUV transient brightenings - First Results by EIT of SOHO JOP80

Details Active region EUV transient brightenings - First Results by EIT of SOHO JOP80 Active region EUV transient brightenings - First Results by EIT of SOHO JOP80

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..186..207b&link_type=abstract

Solar Physics, v. 186, Issue 1/2, p. 207-229 (1999).

Physics

126

Scientific paper

On 13May 1998, the Extreme-Ultraviolet Imaging Telescope (EIT, on board SOHO) has produced a unique image sequence operating in `shutterless mode' (SOHO JOP80). In JOP80, EIT is the lead instrument, followed by several space-born instruments (SXT, TRACE, MDI, CDS, SUMER), as well as two observatories on the ground (in La Palma and Sac Peak). The target of the campaign was a relatively small but rapidly evolving active region (AR8218). For the EIT contribution, a 15s cadence was achieved in the Fexii bandpass at 195Å by leaving EIT's shutter open for 1h and operating the CCD in frame-transfer mode. In this paper, we start the analysis of the huge data set, by making an inventory of the transients observed in the EIT image sequence. Besides scatter plots of duration, size and radiative output of the detected EUV brightenings, we discuss in full detail the morphology and evolution of several typical events. These transients range from a B3.5 flare producing a large plasma flow along pre-existing loops, to EUV versions of active region transient brightenings as previously observed by SXT on board Yohkoh. In addition, a new class of weaker footpoint brightenings is discussed that produce wave-like disturbances propagating along quasi-open field lines. This new class of propagating disturbances extends the wide variety of transient phenomena that we discovered in the EIT data, and makes the potential for inter-instrumental studies of the JOP80 data all the more exciting. We stress the necessity of such forthcoming studies to reach an instrument-independent classification of small-scale solar transients.

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