Periodic solar EUV flux monitored near Venus

Details Periodic solar EUV flux monitored near Venus Periodic solar EUV flux monitored near Venus

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..123....7w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 123, no. 1, 1989, p. 7-20.

Physics

7

Extreme Ultraviolet Radiation, Solar Flux, Solar Oscillations, Solar Rotation, Electrostatic Probes, Harmonics, Nimbus 7 Satellite, Pioneer Venus 1 Spacecraft, Solar Interior, Stellar Envelopes, Venus (Planet)

Scientific paper

A detector sharing the orbital rate of Venus has a unique perspective on solar periodicities. Fourier analysis of the 8.6 year record of solar EUV output gathered by the Langmuir probe on Pioneer Venus Orbiter shows the influences of global oscillation modes located in the convective envelope and in the radiative interior. Seven of the eight lowest angular harmonic r-mode familes are detected by their rotation rates which differ almost unmeasurably from ideal theoretical values. This determines a mean sidereal rotation rate for the envelope of 457.9 + or - 2.0 nHz which corresponds to a period of 25.3 days. Many frequencies are aliased at + or - 106 nHz by modulation from the lowest angular harmonic r-mode in the envelope.

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