Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0811p&link_type=abstract
American Astronomical Society, SPD meeting #37, #8.11; Bulletin of the American Astronomical Society, Vol. 38, p.232
Astronomy and Astrophysics
Astronomy
Scientific paper
The NSO Array Camera (NAC) observed He 1083nm spectral line profiles in the active region NOAA 10808 before, during and after the X1.8 flare of 13 Sep 2005. The NAC observations were made at the McMath-Pierce main telescope using the spectrograph and the IR grating. The spatial field-of-view was limited to the umbra and immediately surrounding penumbra, but the spectral coverage ranged from 1080 to 1085nm. Before the flare regions of strong downflows (30 km/s) are seen; during the flare very bright emission (2.5 times the continuum intensity) are seen in line center in several kernels near the umbral/penumbral boundary; and after the flare, narrow spatial structures are seen with broad spectral absorption profiles showing downflows exceeding 100 km/s.
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