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| Paper: |
The Effect of Area Averaging on the Approximated Profile of the H α Spectral Line |
| Volume: |
504, Coimbra Solar Physics Meeting: Ground-based Solar Observations in the Space Instrumentation Era |
| Page: |
23 |
| Authors: |
Bodnárová, M.; Utz, D.; Rybák, J. |
| Abstract: |
The Hα line is massively used as a diagnostics of the chromosphere. Often one needs to average the line profile over some area to increase the signal to noise ratio. Thus it is important to understand how derived parameters vary with changing approximations. In this study we investigate the effect of spatial averaging of a selected area on the temporal variations of the width, the intensity and the Dopplershift of the Hα spectral line profile. The approximated profile was deduced from co-temporal observations in five points throughout the Hα line profile obtained by the tunable Lyot filter installed on the Dutch Open Telescope. We found variations of the intensity and the Doppler velocities, which were independent of the size of the area used for the computation of the area averaged Hα spectral line profile. |
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