Intensity oscillations in the calcium - K line

Details Intensity oscillations in the calcium - K line Intensity oscillations in the calcium - K line

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..245g&link_type=abstract

(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations

Astronomy and Astrophysics

Astronomy

1

Calcium, Chromosphere, K Lines, Solar Oscillations, Vibration Mode, Bandpass Filters, Brightness Distribution, Filtergrams, Solar Atmosphere

Scientific paper

An analysis is undertaken of a time sequence of quiet sun filtergrams taken in the core of the K line, in order to investigate the oscillatory properties of the chromosphere. The physical significance of these intensity variations and their diagnostic capabilities are discussed, and an oscillatory power vs. frequency and mean intensity diagram is noted to indicate the different behaviors of bright regions dominated by low frequency waves and darker regions dominated by high frequency waves. A diagnostic wavenumber-frequency diagram indicates two oscillatory power concentrations which approximately correspond to acoustic and gravity waves, in chromospheric conditions. A theoretical diagnostic diagram computed on the basis of a solar atmosphere model exhibits a 'g-1' chromospheric mode; this corresponds almost exactly to the location of the observed ridge.

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