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arXiv:0706.1856 (astro-ph)
[Submitted on 13 Jun 2007 (v1), last revised 14 Aug 2007 (this version, v2)]

Title:Transition region features observed with Hinode/EIS

Authors:P. R. Young, G. Del Zanna, H. E. Mason, G. A. Doschek, J. L. Culhane, H. Hara
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Abstract: Two types of active region feature prominent at transition region temperatures are identified in Hinode/EIS data of AR 10938 taken on 2007 January 20. The footpoints of 1 MK TRACE loops are shown to emit strongly in emission lines formed at log T=5.4-5.8, allowing the temperature increase along the footpoints to be clearly seen. A density diagnostic of Mg VII yields the density in the footpoints, with one loop showing a decrease from 3x10^9 cm^-3 at the base to 1.5x10^9 cm^-3 at a projected height of 20 Mm. The second feature is a compact active region transition region brightening which is particularly intense in O V emission (log T=5.4) but also has a signature at temperatures up to log T=6.3. The Mg VII diagnostic gives a density of 4x10^10 cm^-3, and emission lines of Mg VI and Mg VII show line profiles broadened by 50 km/s and wings extending beyond 200 km/s. Continuum emission in the short wavelength band is also found to be enhanced, and is suggested to be free-bound emission from recombination onto He^+.
Comments: 11 pages, 9 figures, submitted to PASJ Hinode first results issue
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1856 [astro-ph]
  (or arXiv:0706.1856v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1856
Related DOI: https://doi.org/10.1093/pasj/59.sp3.S727

Submission history

From: Peter Young [view email]
[v1] Wed, 13 Jun 2007 09:27:03 UTC (594 KB)
[v2] Tue, 14 Aug 2007 12:42:46 UTC (656 KB)
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