Linewidths of low-degree acoustic modes of the sun

Bibcode
1990MNRAS.242..135E
Elsworth, Y.; Isaak, G. R.; Jefferies, S. M.; McLeod, C. P.; New, R.; Pallé, P. L.; Régulo, C.; Roca-Cortés, T.
Bibliographical reference

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

Advertised on:
1
1990
Number of authors
8
IAC number of authors
3
Citations
25
Refereed citations
22
Description
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.
Type
Refereed
Helioseismology
Solar oscillations
Solar atmosphere

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