Discrete high-frequency p-modes as probes of structures in the chromosphere, transition region, and lower corona of the sun

Details Discrete high-frequency p-modes as probes of structures in the chromosphere, transition region, and lower corona of the sun Discrete high-frequency p-modes as probes of structures in the chromosphere, transition region, and lower corona of the sun

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l.141l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 2, p. L141-L144.

Astronomy and Astrophysics

Astrophysics

12

Chromosphere, P Waves, Solar Atmosphere, Solar Corona, Solar Oscillations, Wave Reflection

Scientific paper

Solar acoustic waves with frequencies greater than the well-known acoustic cutoff frequency nu(c) of about 5.3 mHz can be trapped to form discrete eigenfrequency spectra owing to the significant reflection at the chromosphere-corona transition region. The frequency interval Delta nu(p) at a given l between adjacent eigenfrequencies above nu(c) is estimated to be systematically smaller than that below nu(c) by about 5-30/micro-Hz. We provide observational evidence to confirm this expected change of Delta nu(p) across nu(c), in the range 4-17 micro-Hz for l in the range 50 - 150. We identify the observed regularly spaced power peaks at frequencies higher than nu(c) as standing acoustic oscillations trapped by the transition region.

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