Cloud Modeling of a Network Region in H-alpha

Abstract

In this paper, we analyze the physical properties of dark mottles in the chromospheric network using two dimensional spectroscopic observations in H-alpha obtained with the Gottingen Fabry-Perot Spectrometer in the Vacuum Tower Telescope at the Observatory del Teide, Tenerife. Cloud modeling was applied to measure the mottles' optical thickness, source function, Doppler width, and line of sight velocity. Using these measurements, the number density of hydrogen atoms in levels 1 and 2, total particle density, electron density, temperature, gas pressure, and mass density parameters were determined with the method of Tsiropoula & Schmieder (1997). We also analyzed the temporal behaviour of a mottle using cloud parameters. Our result shows that it is dominated by 3 minute signals in source function, and 5 minutes or more in velocity.

6 pages, 5 figures, accepted for publication in Astronomische Nachrichten - Astronomical Notes

References in corpus (1)

• Magnetoacoustic shocks as driver of quiet Sun mottles

Cited by in corpus (4)

• The formation of the Halpha line in the solar chromosphere
• The energy of waves in the photosphere and lower chromosphere: III. Inversion setup for Ca II H spectra in local thermal equilibrium
• High-resolution imaging spectroscopy of two micro-pores and an arch filament system in a small emerging-flux region
• Oscillatory behavior of chromospheric fine structures in a network and a semi-active regions