Other
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..143k&link_type=abstract
Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a
Other
Sun, Chromosphere, Oscillation, Grain
Scientific paper
H grains are small features of strong upward motions in the chromosphere, which are seen as small dark features in the filter image centered at H blue wing. They are found ubiquitously in the interiors of network cells in the quiet region and their typical size and duration are 1000km and 1 min respectively. We obtained H filter images and H spectra simultaneously in the quiet region with Domeless Solar Telescope(DST) at Hida Observatory, Kyoto University. Sequential data of 80 min in good seeing condition allows us to study the temporal evolution of H grains in detail. Our analysis of H spectra shows that the grains appeared repetitively at the same location with interval of 3 min, which means that the generation of grains are closely related to the chromospheric oscillation. The line broadening preceding the upward motion of grains suggests that the grains are produced or triggered by the shock in the chromosphere. Chromospheric grains have been observed in other lines such as Ca II H and K, and their characteristics are summarized in the excellent review of [1]. H and Ca II grains are supposed to be the different aspect of the same phenomena. The relation between grains of H and other lines should be studied to determine the origin of chromospheric grains.
Kamio Suguru
Kurokawa Hiroki
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