A seven-month solar cycle observed with the Langmuir probe on Pioneer Venus Orbiter

Details A seven-month solar cycle observed with the Langmuir probe on Pioneer Venus Orbiter A seven-month solar cycle observed with the Langmuir probe on Pioneer Venus Orbiter

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8663h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8663-8671.

Physics

8

Electrostatic Probes, Pioneer Venus Spacecraft, Satellite-Borne Instruments, Solar Cycles, Lyman Alpha Radiation, Photoelectrons, Solar Mesosphere Explorer, Solar Radiation

Scientific paper

Data collected by the Langmuir probe aboard the Pioneer Venus orbiter (PVO) over the years 1979 though 1987 were normalized to remove the long-period 11-year solar maximum to minimum trend and were analyzed for periodicity. Results yield evidence for the existence of an approximately 7-month solar cycle, which was also observed from SME Lyman alpha and 2800-MHz radio flux measurements carried out from an earth-based platform. This coincidence suggests that the cycle is an intrinsic periodicity in the solar output. The cycle has a frequency independent of the orbital frequency of the PVO and is distinct from a 'rotating beacon' cycle whose period depends on the orbital motion of the PVO about the sun. The second most dominant cycle discovered was a 5-month period. Results of an oscillation model of solar periodicity indicate that the 7-month and 5-month cycles are caused by long-lived flux enhancements from nonlinear interactions of global oscillation modes in the sun's convective envelope (r modes) and radiative interior (g modes).

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