H-alpha diagnostics of (post)-flare loops based on narrow-band filtergram observations

Details H-alpha diagnostics of (post)-flare loops based on narrow-band filtergram observations H-alpha diagnostics of (post)-flare loops based on narrow-band filtergram observations

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..110..343h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 110, no. 2, 1987, p. 343-357.

Physics

24

Coronal Loops, Filtergrams, H Alpha Line, Narrowband, Solar Flares, Absorption Spectra, Emission Spectra, Gas Pressure, Solar Temperature, Stellar Models, Thermodynamic Equilibrium

Scientific paper

Using narrow-band Hα filtergrams, the authors develop a quantitative non-LTE approach to determine the physical conditions prevailing at the tops of (post)-flare loops observed against the solar disc. At temperatures 10,000 - 15,000K, the tops of flare loops turn to emission at Hα line center when the gas pressure Pg reaches 1 dyn cm-2 and should be clearly visible for Pg ⪆ 3 dyn cm-2, independently of the loop diameter. This situation corresponds to the electron density of the order 1012cm-3. The contrast of flare-loops (in projection on the disc) at Hα line center is mainly the function of Pg, while in the line wings (Hα±1 Å) the loop can be visible in absorption or emission only when rather strong microturbulence is present or for unrealistically high gas pressures. Finally, the authors briefly discuss their diagnostical results in frame of the latest (post)-flare loop model.

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