The relationship between UV and X-ray active region structures

Details The relationship between UV and X-ray active region structures The relationship between UV and X-ray active region structures

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997soph..175..541m&link_type=abstract

Solar Physics, Volume 175, Issue 2, pp.541-551

Physics

19

Scientific paper

Yohkoh and the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) jointly observed two brightenings in active region NOAA 7981 on 6 August 1996. Combining the UV data from CDS with information from the high time resolution coronal images obtained with the Soft X-ray Telescope (SXT) on Yohkoh, provides us with important information on the relationship between the transition region and corona. Our observations show that cool plasma (Te = 2.2 x 10-5 K) can lie at the same altitude as the hot coronal plasma (Te = 1 4 x 106 K). The lower temperature structure is not formed from the cooling of the hotter coronal loop. We are also able to observe a low temperature cut-off of Te = 1 4 x 106 K for a loop which repeatedly brightened over the period of approximately one day.

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