Two-dimensional speckle spectroscopy of the moustache phenomenon on the Sun
1997; EDP Sciences; Volume: 323; Issue: 2 Linguagem: Inglês
ISSN
1432-0746
Autores Tópico(s)Solar Radiation and Photovoltaics
ResumoThis paper deals with a detailed morphological and photometric investigation of solar small-scale features in the vicinity of an irregular sunspot group. The observations were performed with the Vacuum Tower Telescope at the Observato- rio del Teide/Tenerife on May 18, 1994. The speckle masking method has been applied to reconstruct almost diffraction lim- ited ltergrams in two different wavelength regions. For this purpose, we used the two-dimensional spectrometer of the Uni- versit¨ ats-Sternwarte G¨ ottingen which was slightly modied for the speckle observations. In the narrow-band ltergrams, we studied the intensity enhancement in the inner wings of the strong chromospheric absorption line NaD2 (moustache phe- nomenon). The corresponding ltergrams in the white-light channelshowaclearcorrelationofphotosphericligreeandthe moustache phenomenon. The bandwidth of the small-passband channel amounts to 0.014 nm. This is the highest spectral reso- lution reached with speckle masking imaging so far.
Referência(s)