Observations of solar wave/instability phenomena as imaged by EIT/SOHO, TRACE and Yohkoh/SXT

Details Observations of solar wave/instability phenomena as imaged by EIT/SOHO, TRACE and Yohkoh/SXT Observations of solar wave/instability phenomena as imaged by EIT/SOHO, TRACE and Yohkoh/SXT

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..537..168b&link_type=abstract

WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS. AIP Conference Proceedings, Volume 537, pp. 168-175 (2000).

Computer Science

Ultraviolet, Magnetohydrodynamic Waves

Scientific paper

On May 13 1998, active region NOAA 8218 was observed in the context of the SOHO/JOP80 campaign by an array of 8 different ground-based and space-born instruments. The emphasis was set on imaging of small-scale dynamics in this relatively small but rapidly evolving AR. In particular, SOHO/EIT (195 Å), TRACE (171 Å) and YOHKOH/SXT produced subfield image sequences at their respective highest possible rates. We searched for wave and instability phenomena by using an automated recognition scheme. This result in a wide inventory of propagating disturbances and localized transient brightenings. By comparing the soft X-ray signature as recorded by SXT with the EUV-signature as collected by EIT and TRACE, we are able to distinguish between various types of active region transients. As such we find that the strongest brightenings observed by EIT are indeed the EUV counterparts of the previously reported ARTBs seen by SXT. Weaker brightenings seen by EIT do often not have an X-ray counterpart. Moreover, in an extended system of faint quasi-open loops, we find propagating disturbances, with speeds of the order of 100 km/s, both in EIT and TRACE images. These are interpreted as sonic perturbations. The brightenings will be discussed in this paper while the propagating disturbances are described in the presentation by Eva Robbrecht at this conference. .

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