Relation between intensity and Dopplershifts in the quiet Sun transition region

Details Relation between intensity and Dopplershifts in the quiet Sun transition region Relation between intensity and Dopplershifts in the quiet Sun transition region

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..107g&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

Physics

Solar Transition Region

Scientific paper

In this work we used CDS and SUMER (SOHO) observations of a quiet region (41°W 41°N) on the 28th of July 1996. The study of the histograms of the velocities corresponding to the network and the internetwork regions, shows that the network plasma is redshifted with respect to the internetwork one. The shifts in the histograms are small, but they are systematic for all lines. It should be mentioned that the internetwork is also statistically redshifted, with the exception of the He I line. In the low transition region the morphology in the intensity images is different from the morphology in the Dopplergrams. It seems that the network intensity structures correspond to more than one in the Dopplergrams, since the latter are quite smaller than the intensity structures. This was verified by calculating the average autocorrelation function for intensity images and Dopplergrams of spectral lines from SUMER and CDS. On the average, the FWHM of the autocorrelation function of the intensity images is two times larger than that of the corresponding Dopplergram ones.

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