Photospheric and Chromospheric structure of Sunspots using IBIS.

Details Photospheric and Chromospheric structure of Sunspots using IBIS. Photospheric and Chromospheric structure of Sunspots using IBIS.

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11a..04b&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11A-04

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere, 7594 Instruments And Techniques

Scientific paper

We use the Interferometric BIdimensional Spectrometer (IBIS) of the INAF/Arcetri Astrophysical Observatory and installed at the National Solar Observatory's (NSO) Dunn Solar Telescope, to understand the structure of sunspots. Using the spectral lines FeI 6301.5Å, FeII 7224.4Å and CaII 8542.6Å, we examine the spectroscopic variation of sunspot penumbral and umbral structures about the heights of formation of these lines. Simultaneous white-light imaging data helps us to register and track the images. We map the spatio-temporal variation of Doppler signatures in these spectral lines, from the photosphere to the chromosphere, and discuss the implication of these variations for sunspot models. These high resolution observations were acquired on 2004 July 30-31, on a sunspot NOAA 10654, using the higher order NSO adaptive optics system.

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