Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..232d&link_type=abstract
Nature (ISSN 0028-0836), vol. 322, July 17, 1986, p. 232-234. Research supported by Colgate University.
Astronomy and Astrophysics
Astronomy
19
Chromosphere, Helioseismology, Infrared Astronomy, Vibration Mode, Absorption Spectra, Hydroxyl Radicals, Power Spectra, Time Series Analysis
Scientific paper
Time-series observations of an infrared solar OH absorption line profile have been obtained on two consecutive days using a laser heterodyne spectrometer to view a 2 arcsec portion of the quiet sun at disk center. A power spectrum of the line center velocity shows the well-known photospheric p-mode oscillations very prominently, but also shows a second feature near 4.3 mHz. A power spectrum of the line intensity shows only the 4.3 mHz feature, which is identified as the fundamental p-mode resonance of the solar chromosphere. The frequency of the mode is observed to be in substantial agreement with the eigenfrequency of current chromospheric models. A time series of two beam difference measurements shows that the mode is present only for horizontal wavelengths greater than 19 Mm. The period of a chromospheric p-mode resonance is directly related to the sound travel time across the chromosphere, which depends on the chromospheric temperature and geometric height. Thus, detection of this resonance will provide an important new constraint on chromospheric models.
Deming Drake
Espenak Fred
Glenar David A.
Hill Adrian
Kaeufl Hans Ulrich
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