Investigation of a Color-Color Method to Determine Temperatures along Coronal Structures Using TRACE Data

Details Investigation of a Color-Color Method to Determine Temperatures along Coronal Structures Using TRACE Data Investigation of a Color-Color Method to Determine Temperatures along Coronal Structures Using TRACE Data

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...655.1127n&link_type=abstract

The Astrophysical Journal, Volume 655, Issue 2, pp. 1127-1133.

Astronomy and Astrophysics

Astronomy

11

Sun: Corona, Sun: Uv Radiation

Scientific paper

This paper readdresses the double filter ratio temperature analysis method employed on TRACE 171, 195, and 284 Å coronal images. Here we reanalyze a feature from a TRACE data set published initially in 2002 along with a new TRACE example. The revised data set was termed an ``EUV jet'' and was observed on 1998 July 29. The new example is at the base of a large (relatively static) loop structure on the solar limb and was observed on 2005 July 26. In both cases the structures are easily shown to be present in all three EUV passbands. This work investigates two important changes to the original analysis. First, a new temperature color-color curve is employed that utilizes revised TRACE response functions; these take into account the emission from Fe VIII, which significantly affects the 195 Å passband. Second, three different background subtraction techniques are used. The results subsequently show that when using this method for these examples, it is very difficult to assign specific temperature values to individual data points. Reasons for this conclusion are discussed.

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