Solar p-mode linewidths from recent BiSON helioseismological data

Details Solar p-mode linewidths from recent BiSON helioseismological data Solar p-mode linewidths from recent BiSON helioseismological data

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.288..623c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 288, Issue 3, pp. 623-626.

Astronomy and Astrophysics

Astronomy

33

Convection, Sun: Atmosphere, Sun: Oscillations

Scientific paper

We present low-degree solar p-mode linewidths from the analysis of several high-resolution frequency spectra generated from high-quality Doppler velocity data collected - in integrated sunlight - by the Birmingham Solar-Oscillations Network (BiSON) between 1991 July and 1995 July. We have used linewidths, Deltanu, measured in a 32-month frequency spectrum, to test the power-law dependence of the widths at low frequencies. Over the range 1473<=nu<=1822Hz, we find Deltanu~nu^7.0+/-1.5. If an effort is made to correct for finite observing time systematics, the fitted index increases to 7.3 (and even higher, to 7.8, if a naive, single-bin-width correction is applied). This is somewhat steeper than reported in previous observations of intermediate-degree modes, and is more in line with theoretical calculations which predict Deltanu~nu^8 over this frequency range. If one assumes that the steep dependence reported here persists down to lower frequencies, low-degree-mode coherence (e-folding) times at 800Hz of >14yr, and at 300 muHz (i.e. near the frequency expected for the fundamental) of >13000yr are implied.

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