Simultaneous Maps of the Chromosphere for Ca II H and Ca II 8662

Details Simultaneous Maps of the Chromosphere for Ca II H and Ca II 8662 Simultaneous Maps of the Chromosphere for Ca II H and Ca II 8662

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.40r&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

We study chromospheric dynamics by analyzing long (up to 3200 s), high spatial resolution time series of slit spectra of the Ca II H line and the Ca II infrared line at 8662 Angstrom recorded simultaneously near disk center of the Sun with the Echelle Spectrograph of the VTT on Tenerife in June 2007. Fast scans with 6 steps (0.5" per step) were done resulting in small stripes 3.5" wide and 160" long. A scan repetition time of 8 s was reached. These small 2D maps allow us to discover bright points, to follow their horizontal motion, and to associate photospheric objects. Horizontal variations of the intensity with time can be found for both lines and all wavelengths, including cases in which patches of enhanced intensity move rapidly over the entire map, with horizontal velocities of up to 30 km/s.
We study also a series of large x-y-maps (size 160" x 120"), simultaneously recorded for the Ca II H and Ca II 8662 lines. Because of the high spectral resolution we get for both lines 975 wavelength points covering spectral ranges of nearly 4.7 (H) and 10.3 (8662) Angstrom and therefore also 975 large maps for Ca II H as well as Ca II 8662: one X-Y map for each resolved wavelength. Our quasi-monochromatic maps have much narrower contribution functions than the usual filtergrams taken in rather broad spectral regions of the Ca II H & 8662 lines; thus they allow a more precise mapping of features to atmospheric regions of limited height extension.

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