Mechanical flux in the solar chromosphere. II - Determination of the mechanical flux

Details Mechanical flux in the solar chromosphere. II - Determination of the mechanical flux Mechanical flux in the solar chromosphere. II - Determination of the mechanical flux

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84...99s&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 99-105.

Astronomy and Astrophysics

Astrophysics

20

Chromosphere, Flux Density, Plasma Turbulence, Pressure Oscillations, Solar Atmosphere, Solar Oscillations, Atmospheric Temperature, Atmospheric Turbulence, Calcium, Doppler Effect, Fourier Analysis, Line Spectra, Plasma Waves, Solar Spectra, Weighting Functions

Scientific paper

The observations of two lines of Ca II (8542-8498) made with the Sacramento Peak Tower and formation altitudes values Z(omega) for these two lines determined by weighting functions are used to evaluate, for each frequency omega, the mechanical flux F(omega) corresponding to the altitude Z(omega). Corrections taking into account the weakening of waves of wavelengths smaller than the line formation layer were applied to the flux. The corrected flux does not show a significant increase with the frequency (up to 10 mHz), which seems to indicate that nonthermal microturbulence does not correspond necessarily to progressive wave. The mechanical flux integrated over the frequency range 0-10 mHz reaches at the most 2000 erg/sq cm s in the middle chromosphere (1100 km). This is not sufficient to balance the energy losses of the transition zone and the corona.

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