AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 16. Solar Corona
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southeast Exhibit Hall

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[16.03] SOHO and Yohkoh Observations of a Small Active Region

G. H. Fisher, N. W. Griffiths (UC Berkeley), D. T. Woods (UC Berkeley, LLNL), L. W. Acton (Montana State University), O. H. W. Siegmund (UC Berkeley)

We describe the observation of a small active region on 19 April 1997 using the SXT telescpe on Yohkoh, the EIT telescope on SOHO, and the SUMER spectrograph on SOHO. The SUMER observation resulted in a rastered image of approximately 13 by 70 arcseconds, with a spatial resolution of approximately 1 square arcsecond. The SUMER data included transition region lines of N and O, as well as chromospheric continuum emission and Fe XII emission from the corona. Density sensitive O IV lines, in conjunction with the other observed emission allows us to simultaneously determine density and emission measure distributions.

We study the variation of density, emission measure, and emitting volume within the observed region and compare our results with a similar study of the Quiet Sun.

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