Computer Science
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..615w&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Computer Science
1
Sun, Waves, Corona, Mhd
Scientific paper
The high-cadence Solar Eclipse Corona Imaging System (SECIS) observed a strong 6-second oscillation in an active region coronal loop, during the 1999 August 11 total solar eclipse. In the present paper we show that this oscillation is associated with a fast-mode wave that travels through the loop apex with a velocity of ~2000 km s-1. We use near-simultaneous SoHO/CDS obervations to calculate the parameters of the loop and its surroundings such as density, temperature and their spatial variation. We also calculate radiative losses from the loop in the temperature range 105.8 - 106.4K, and compare these losses with the wave energy density. Although the wave travels a distance greater than λ/4π and therefore meets a necessary criterion for slow dissipation, the dissipation length is well in excess of the loop length. The temporal evolution of the intensity is found to be in agreement with the model of an impulsively generated, fast-mode wave.
Gallagher Peter. T.
Katsiyannis Athanassios C.
Keenan Francis P.
Mathioudakis Mihalis
McAteer James R. T.
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