Linewidths of low-degree acoustic modes of the sun

Details Linewidths of low-degree acoustic modes of the sun Linewidths of low-degree acoustic modes of the sun

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..135e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 1, 1990, p. 135-140. Research supported by SE

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22

Helioseismology, Propagation Modes, Solar Oscillations, Solar Spectra, Spectral Line Width, Doppler Effect, P Waves, Power Spectra, Solar Atmosphere

Scientific paper

Estimates of the spectral linewidths of low degree (l = 0 and l = 1), 5-min p-modes obtained from Doppler shift observations in 1984 (63 d) and 1986 (63 d) are reported. The observed linewidths increase from 0.5 micro-Hz at 2000 micro-Hz to 3 micro-Hz at 3800 micro-Hz for l = 0. Comparison with other data suggests that for a given frequency the linewidth increases with increasing values of l. On the assumption that the linewidth is substantially due to damping processes, the linewidths are consistent with e-folding times between 3.7 and 0.6 d.

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