Line Shift Variations in Solar Transition Region Lines

Details Line Shift Variations in Solar Transition Region Lines Line Shift Variations in Solar Transition Region Lines

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..619d&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

Down-Flow, Transition Region, Line Profiles

Scientific paper

Two high time cadence datasets, taken in C III 977Å and O VI 1032Å were analysed in an effort to establish the extent of the variability in the Doppler-shift of typical mid-transition region lines. In C III, the shortest time-scale variability seems to occur in the network boundary regions where the line-shift can vary by 7-8 km s-1 in less than 1 min. The internetwork region also shows variability although this tends to be longer lived, ˜2-3 mins. The average C III line-shift in all regions is for a red-shift of ˜ 8 km s-1 in very good agreement with that derived by others. Furthermore, there does not seem to be any obvious difference in the average line-shift in network and internetwork regions. On a few rare occasions, the C III line was blue-shifted. The O VI line was also red-shifted with the network region showing evidence for a periodicity. These observations were compared to model line profiles based on the response of a 2D MHD environment representing the solar transition region to micro-scale energy depositions. A variety of temperatures at which the energy deposition takes place as well as the amount of energy deposited was examined.

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