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| Paper: |
Dynamics of Solar Fine Structure: Observation with High Spatial Resolution |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
553 |
| Authors: |
Al, N.; Bendlin, C.; de Boer, C. R.; Denker, C.; Kneer, F.; Schmitt, D.; Volkmer, R.; Wilken, V. |
| Abstract: |
The Sun is an ideal object for studying non-magnetic and magnetic processes in cool stars. Here, we focus on fine structures of a few 100 km in the solar atmosphere. Granular overshoot, motions and waves of magnetic elements in the quiet Sun and in plages, etc., all affect the atmospheric structure from the bottom of the photosphere up to the corona and the solar wind. Observations with high spatial resolution are required to reveal the dynamic behaviour and to understand the underlying physical processes. During the past five years, speckle methods have become an excellent tool to obtain images of solar fine structure with diffraction-limited resolution. We demonstrate by some examples how one can gain new insights from speckle interferometry. Likewise, spectroscopy of solar fine structure is also making rapid progress towards high spatial resolution. Our two-dimensional, narrow-band spectrometer (Delta\lambda = 20-30 mAA ), working with a scanning Fabry-Perot interferometer, proves very powerful in several aspects. We present some results obtained in Na D_2 from the quiet solar chromosphere. Using suitable observing techniques together with image restoration, we aim at achieving diffraction-limited resolution also for narrow-band spectroscopy. |
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