Observations of high-frequency and high-wavenumber solar oscillations

Details Observations of high-frequency and high-wavenumber solar oscillations Observations of high-frequency and high-wavenumber solar oscillations

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..736f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 736-738. Research supported by Lockheed Corp.

Astronomy and Astrophysics

Astrophysics

44

Chromosphere, Doppler Effect, Line Spectra, Solar Oscillations, Charge Coupled Devices, Power Spectra, Sodium, Transfer Functions

Scientific paper

Doppler shift measurements of the Na D1 absorption line reveal solar oscillations in a new regime of frequency and wavenumber. Oscillations of vertical velocities in the temperature minimum and low chromosphere of the sun are observed with frequencies ranging up to 9.5 mHz. The fundamental modes appear with wavenumbers up to 5.33/Mm (equivalent spherical harmonic degree 3710). No evidence for chromospheric modes of 3-minute period is reported.

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