Non-LTE hydrogen-line formation in moving prominences

Details Non-LTE hydrogen-line formation in moving prominences Non-LTE hydrogen-line formation in moving prominences

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..163h&link_type=abstract

In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 163-167 (SEE N87-20871 13-92)

Physics

Brightness, Doppler Effect, Emission, Hydrogen, Plasmas (Physics), Solar Corona, Solar Prominences, Sun, Balmer Series, Lyman Spectra, Solar Physics, Variations

Scientific paper

The behavior of hydrogen-line brightness variations, depending on the prominence-velocity changes were investigated. By solving the NON-Local thermodynamic equilibrium (LTE) problem for hydrogen researchers determine quantitatively the effect of Doppler brightening and/or Doppler dimming (DBE, DDE) in the lines of Lyman and Balmer series. It is demonstrated that in low-density prominence plasmas, DBE in H alpha and H beta lines can reach a factor of three for velocities around 160 km/sec, while the L alpha line exhibits typical DDE. L beta brightness variations follow from a combined DBE in the H alpha and DDE in L alpha and L beta itself, providing that all relevant multilevel interlocking processes are taken into account.

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