Chromospheric oscillations observed with OSO 8. IV - Power and phase spectra for C IV

Details Chromospheric oscillations observed with OSO 8. IV - Power and phase spectra for C IV Chromospheric oscillations observed with OSO 8. IV - Power and phase spectra for C IV

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229.1147a&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 1147-1162.

Astronomy and Astrophysics

Astronomy

58

Chromosphere, Oso-8, Solar Oscillations, Solar Spectra, Line Spectra, Power Spectra, Ultraviolet Astronomy

Scientific paper

OSO 8 time series of profiles of the C IV line at 1548 A and for the continuum near 1900 A are analyzed to determine the properties of solar oscillations in the lower transition region and to obtain phase delays between the temperature-minimum region and the lower transition region. Power-spectrum and phase-spectrum analyses of 30-min data segments are performed. It is found that: (1) short-duration periodic oscillations in the 3-5 mHz band occur in about 20% of the 30-min segments; (2) these oscillations are of solar origin and have phase delays with height characteristic of waves propagating vertically with phase speeds close to the sound speed; (3) maximum intensity lags maximum redshift by about 120 deg and leads maximum blueshift by approximately 60 deg; (4) most of the solar fluctuations in the C IV line are low-amplitude aperiodic events in which the fluctuation in intensity is correlated with blueshift; and (5) the intensity fluctuations are proportional to mean intensity (A) in bright solar features but to the square root of A in quiet solar regions.

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