Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...590.1095n&link_type=abstract
The Astrophysical Journal, Volume 590, Issue 2, pp. 1095-1110.
Astronomy and Astrophysics
Astronomy
26
Sun: Activity, Sun: Corona, Sun: X-Rays, Gamma Rays
Scientific paper
A suite of images from the XUV Doppler Telescope (XDT), the Yohkoh Soft X-ray Telescope (SXT), and the Extreme-Ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observatory (SOHO) allow us to see the whole (T>1 MK) temperature evolution of coronal loops. The detailed morphological comparison of an active region shows that hot loops seen in SXT (T>3 MK) and cool loops seen in the the EIT 195 Å band (T~1.5 MK) are located in almost alternating manner. The anticoincidence of the hot and the cool loops is conserved for a duration much longer than the estimated cooling timescale. However, both hot and cool loops have counterparts in the intermediate-temperature images. The cross-correlation coefficients are higher for neighboring temperature pairs and lower for pairs with larger temperature differences. These results suggest that loops are not isothermal but rather have a differential emission measure distribution of modest but finite width that peaks at different temperatures for different loops.
Gurman Joseph B.
Hara Hirohisa
Kano Ryouhei
Kobayashi Ken
Nagata Shin'ichi
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