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Evidence for coronal plasma oscillations over supergranular cells

Published online by Cambridge University Press:  01 November 2006

C. Gontikakis
Affiliation:
Research Center for Astronomy and Applied Mathematics, Academy of Athens Soranou Efessiou 4, 115 27 Athens Greece email: [email protected]
H. Peter
Affiliation:
Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany email: [email protected]
H. C. Dara
Affiliation:
Research Center for Astronomy and Applied Mathematics, Academy of Athens Soranou Efessiou 4, 115 27 Athens Greece email: [email protected]
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Abstract

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Evidence of coronal oscillations over the interior of supergranular cells was found through SUMER observations. The observations are rasters of quiet Sun regions and the oscillations were detected, in the Ne ${\sc viii}\, 770 \AA$ Doppler maps, as a characteristic pattern. It should be noted that the Ne ${\sc viii}\,$ ion has coronal formation temperature (650 000 K) and that reports of oscillations in the quiet Sun corona are scarce. Magnetic extrapolation from MDI magnetogram showed that at the location where the oscillation was detected, the gas and magnetic pressures get equalized ($\beta$=1) higher in the atmosphere, compared to the surrounding, non oscillating quiet Sun. This could indicate a non-compressible wave propagating inside the gas dominated medium of the cell causing the detected oscillation.

Type
Contributed Papers
Copyright
© 2006 International Astronomical Union