Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975phdt.........4a&link_type=abstract
Ph.D. Thesis California Univ., San Diego.
Astronomy and Astrophysics
Astronomy
7
Extraterrestrial Radio Waves, Interplanetary Space, Pulsars, Radio Sources (Astronomy), Scintillation, Solar Wind Velocity, Spectra, Very High Frequencies
Scientific paper
Interplanetary scintillations (IPS) at 74 MHz, observed during 1971-1974, were analyzed with the aims of (1) relating the IPS variance and third statistical moment to physical properties of the radio source and the solar wind, and (2) using IPS-determined solar wind velocity spectra to study velocity fluctuations on time scales of 0.5-6 minutes and 2-100 days. The annual maximum value of the IPS rms flux decreased by 39 percent during 1971.4-1974.6. Total 74 MHz flux was determined as a function of time. The skewness parameter was also measured. Solar wind velocity spectra in the 0.003-0.03 Hz band revealed no significant variations. For velocity spectra in the band 0.01-0.5 cycles/day, the velocity variance and degree of correlation after one solar rotation lag varied strongly with time while the mean solar wind velocity did not. Systematic differential rotation of the solar wind with heliographic latitude was not indicated.
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