If such external influences as the impact of a comet on the solar surface could destroy or mask the coherence of observed solar oscillations, the scope and effectiveness of extended study in this field would be considerably limited. It is therefore important to investigate any possible effects due to the recently reported comet impacts on the sun

A statistical analysis of the frequency spectrum of 85 days of data obtained from integral solar velocity signals, has shown that significant signals exist in the frequency range 25 - 150 μHz. The signal structure is shown to have characteristics of constant period spacings indicative of the existence of g modes in the solar oscillation spectrum

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Extensive solar data obtained over the period May to August 1982 are analyzed to show the continued existence, over a six-year period, of a 13-day velocity signal of 6 m/s amplitude. Mean daily velocity signals are shown with a superimposed best-fit sine wave, and the power spectrum obtained from that fit is presented. Data comparing measured and

By operating two observing stations, one at Izana on Tenerife and the other at Haleakala on Maui, up to 22 hours of continuous solar surface velocity data per day are obtained. Correlation of two station data provides confirmation of the solar origin of the signals and the improved window function and long time span of data collection yield clear

The analysis of high-resolution H-alpha and white-light observations on the emergence of 73 active regions shows an intrinsically different behavior for both the large and small ones. The small active regions (magnetic flux of approximately 5 x 10 to the 21st Mx) display circular structures of supergranular size with pores only at the borders