Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..616r&link_type=abstract
Nature, vol. 279, June 14, 1979, p. 616-618.
Astronomy and Astrophysics
Astronomy
41
Magnetic Field Configurations, Magnetic Flux, Planetary Ionospheres, Venus Atmosphere, Buoyancy, Magnetopause, Magnetosheath, Pioneer Venus 1 Spacecraft, Solar Activity Effects, Solar Wind, Spaceborne Astronomy, Thermal Properties, Magnetosheath, Flux, Ropes, Observations, Venus, Ionosphere, Magnetic Fields, Pioneer Venus, Plasmas, Pressure, Flux Ropes
Scientific paper
Short-lived, intense enhancements of magnetic strength observed within the dayside ionosphere of Venus by the Pioneer Venus Orbiter are described and interpreted as due to the passage of the spacecraft through magnetic flux ropes. The magnetic field strength at periapsis was observed to show increases from a few nT up to tens of nT, accompanied by complex variations of the field components. The results of a minimum variance analysis of observed component variations are found to correspond to results of a minimum variance analysis of a passage through a model helical magnetic field, which resembles a rope of twisted magnetic flux tubes. An examination of the amplitudes and occurrence frequency with altitude of the flux ropes suggests that either the ionospheric tubes derive from magnetosheath magnetic flux tubes pulled into the ionosphere by solar wind convection, or that they result from a source in the lower ionosphere and percolate upwards due to buoyancy.
Elphic Richard C.
Russell Christopher T.
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