Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53a1046d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH53A-1046
Physics
7509 Corona, 7546 Transition Region, 7549 Ultraviolet Emissions
Scientific paper
The goal of the Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode satellite is to measure such physical parameters as the velocity and density of the solar corona in order to provide an observational basis to understand how coronal plasmas are heated and accelerated. On 2007 January 20, EIS performed a raster of a 128 x 512 arc-sec. area of a quiet region near Sun center. The observing program recorded spectra of He II λ256, formed at 9 × 104 K, and lines of Fe VIII-XV, formed at temperatures spanning the range from 5 × 105 through 2 × 106 K. Maps of intensities, velocities and electron densities derived from these observations are presented and discussed. Intensity maps in He II λ256 show the chromospheric network. Line intensities of Fe X-XIV show small-scale bright points and more extended structures. The intensity map of Fe VIII shows a transition between the two temperatures. The coronal lines reveal regions of high outflow velocities on the order of 100 km s-1 in a compact region and 12 km s-1 in an extended region. The presence of these high velocities in the quiet corona is an entirely new and unexpected result. Electron densities derived from density sensitive line ratios of Fe XII and XIII are typically about 3 - 20×108 cm-3. The highest densities are found in bright, compact areas. For the first time, explosive events in the quiet sun have been observed in the extreme-ultraviolet in He II λ256 profiles and have properties similar to those previously reported.
Dere Ken P.
Doschek George A.
Hansteen Viggo
Harra Louise K.
Mariska John T.
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