Atmosphere above a large solar pore

0399518 - ASÚ 2014 RIV GB eng C - Conference Paper (international conference)
Sobotka, Michal - Švanda, Michal - Jurčák, Jan - Heinzel, Petr - Del Moro, D.
Atmosphere above a large solar pore.
Eclipse on the Coral Sea: Cycle 24 Ascending (GONG 2012, LWS/SDO-5, and SOHO 27). Bristol: Institute of Physics, 2013, 012049/1-012049/7. Journal of Physics Conference Series, 440. ISSN 1742-6588.
[Eclipse on the Coral Sea: Cycle 24 Ascending. Palm Cove (AU), 12.11.2012-16.11.2012]
R&D Projects: GA ČR GAP209/12/0287; GA ČR GPP209/12/P568
Institutional support: RVO:67985815
Keywords : high-spatial-resolution * sunspots * chromosphere
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

A large solar pore with a granular light bridge was observed on October 15, 2008 with the IBIS spectrometer at the Dunn Solar Telescope and a 69-min long time series of spectral scans in the lines Ca II 854.2 nm and Fe I 617.3 nm was obtained. The intensity and Doppler signals in the Ca II line were separated. This line samples the middle chromosphere in the core and the middle photosphere in the wings. Although no indication of a penumbra is seen in the photosphere, an extended filamentary structure, both in intensity and Doppler signals, is observed in the Ca II line core. An analysis of morphological and dynamical properties of the structure shows a close similarity to a superpenumbra of a sunspot with developed penumbra. A special attention is paid to the light bridge, which is the brightest feature in the pore seen in the Ca II line centre and shows an enhanced power of chromospheric oscillations at 3-5 mHz.
Permanent Link: http://hdl.handle.net/11104/0226754