Off-limb EUV line profiles and the search for wave activity in the low corona

Details Off-limb EUV line profiles and the search for wave activity in the low corona Off-limb EUV line profiles and the search for wave activity in the low corona

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...392..319h&link_type=abstract

Astronomy and Astrophysics, v.392, p.319-327 (2002)

Astronomy and Astrophysics

Astrophysics

34

Sun: Uv Radiation, Sun: Atmosphere, Sun: Corona

Scientific paper

Two extreme-ultraviolet (EUV) observations are used to examine the off-limb characteristics of emission line widths of the million K Mg X 625 Å line. To obtain sufficient statistical accuracy, the observations were made over long periods of time and a pixel summing technique is used. The observations are made above the western limb, for quiet corona. The most significant result is the discovery of emission line narrowing as a function of altitude and intensity at altitudes above 50 000 km. The results are compared to past observations, which suggest that emission line broadening, at lower altitudes, is due to the outward propagation of undamped Alfvén waves, in open field regions with decreasing density with altitude. The narrowing at higher altitudes, determined by the current study is interpreted as further evidence for coronal wave activity, but in closed field regions, and most likely the first evidence of the dissipation of Alfvén waves in the corona. An additional result of this work is the identification of a significant line broadening across a narrow region on the limb, which may be due to flows in low-lying loop systems.

Affiliated with

Also associated with

No associations

Rating

Off-limb EUV line profiles and the search for wave activity in the low corona does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Off-limb EUV line profiles and the search for wave activity in the low corona, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Off-limb EUV line profiles and the search for wave activity in the low corona will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1311089