Low-l 5-min oscillation observations

Details Low-l 5-min oscillation observations Low-l 5-min oscillation observations

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87..207k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Sept. 1983, p. 207-219. NSF-supported research.

Physics

3

Solar Oscillations, Spectroheliographs, Charge Coupled Devices, Data Reduction, Doppler Effect, Harmonic Analysis, Line Shape, Radial Velocity, Solar Instruments, Solar Spectra, Spherical Harmonics, Velocity Measurement

Scientific paper

Medium resolution CCD-spectrograph observations have been obtained that are suitable for studying long spatial wavelength 5-min oscillations. The authors find evidence that at wavelengths of order one solar radius the oscillation field is not isotropic. It is also not well described by modes of uniform excitation. The velocity power density per spherical harmonic increases with decreasing l to 1.1×103 cm2 s-2 per 3.5×10-4 Hz angular frequency bandwidth at l = 4. These results are inconsistent with the data of Fossat and Ricort (1975) as analyzed by Christensen-Dalsgaard and Gough (1982), who found a substantially constant modal amplitude at intermediate l values. It is interesting that other calculations have seen a similar dependence at small l in the growth rate of p-modes due to the κ-mechanism.

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