High-resolution analysis of solar photospheric oscillations

Details High-resolution analysis of solar photospheric oscillations High-resolution analysis of solar photospheric oscillations

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..129....1d&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 129, Sept. 1990, p. 1-30. Research supported by CNRS and Observatoire de Paris.

Physics

4

Doppler Effect, Photosphere, Solar Oscillations, Spherical Harmonics, High Resolution, Pressure Oscillations, Vertical Distribution

Scientific paper

The monochromatic solar telescope of the Meudon Observatory has been used to directly image the coherent, 5-min photospheric pressure oscillations whose spherical harmonic degree lies in the 100-1000 range. It is noted that areas with ephemeral concentrations of coherent waves evolve with respect to their morphology and may be moving horizontally at several tenths of km/sec. Interactions of large numbers of waves lead to the maximum vertical velocity of the pulsation at around 100 m/sec irrespective of the size of the waves; extrapolation to the ideal case of a single isolated wave yields a maximum velocity value which is proportional to size.

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