HR: 0830h
AN: SP11A-04    [Abstracts]
TI: Photospheric and Chromospheric structure of Sunspots using IBIS.
AU: * Balasubramaniam, K S
EM: bala@nso.edu
AF: National Solar Observatory, Sacramento Peak, Sunspot, NM 88349 United States
AU: Gary, G A
EM: allen.gary@nasa.gov
AF: NASA/Marshall Space Flight Center, NSSTC Rm. 2039, Huntsville, AL 35812 United States
AU: Reardon, K
EM: kreardon@arcetri.astro.it
AF: INAF/Osservatorio Astrofisico di Arcetri, L.go E. Fermi, 5, Florence, 50125 Italy
AB: 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.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7507 Chromosphere
DE: 7524 Magnetic fields
DE: 7529 Photosphere
DE: 7594 Instruments and techniques
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly