Far-infrared intensity variations caused by 5 minute oscillations

Details Far-infrared intensity variations caused by 5 minute oscillations Far-infrared intensity variations caused by 5 minute oscillations

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..475l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 475-479.

Astronomy and Astrophysics

Astronomy

6

Chromosphere, Infrared Sources (Astronomy), Solar Oscillations, Brightness Temperature, Far Infrared Radiation, Radiant Flux Density, Time Series Analysis

Scientific paper

Observations of solar IR intensity variations at 50, 100, and 200 microns were made simultaneously and cospatially with Doppler measurements in the sodium D1 line at 5896 A. Brightness temperature variations of several K in amplitude are highly correlated with five minute Doppler oscillations. The brightness variations are attributed to work done on the chromospheric medium by compression, driven by the five minute oscillations. The Doppler oscillations lead the brightness variations by about 47 deg in phase at 50 and 100 microns and by about 72 deg in phase at 200 microns.

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