Magnetic flux ropes in the Venus ionosphere - Observations and models

Details Magnetic flux ropes in the Venus ionosphere - Observations and models Magnetic flux ropes in the Venus ionosphere - Observations and models

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88...58e&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 58-72.

Physics

58

Atmospheric Models, Ionospheric Currents, Magnetic Field Configurations, Magnetic Flux, Planetary Ionospheres, Planetary Magnetic Fields, Venus Atmosphere, Data Acquisition, Lines Of Force, Magnetometers, Pioneer Venus 1 Spacecraft, Venus, Ionosphere, Magnetic Properties, Flux Ropes, Observations, Models, Structure, Comparisons, Density, Coordinate Systems, Currents, Plasmas, Electric Fields, Conductivity, Heating, Magnetic Fields, Spectra, Pvo, Diagrams, Calculations, Characteristics, Data, Magnetometer, P

Scientific paper

Pioneer Venus Orbiter data are used as evidence of naturally occurring magnetic field filamentary structures which can be described by a flux rope model. The solar wind is interpreted as piling up a magnetic field on the Venus ionosphere, with the incident ram pressure being expressed as magnetic field pressure. Currents flowing at the ionopause shield out the field, allowing magnetic excursions to be observed with magnitudes of tens of nT over an interval of a few seconds. A quantitative assessment is made of the signature expected from a flux rope. It is noted that each excursion of the magnetic field detected by the Orbiter magnetometer was correlated with variations in the three components of the field. A coordinate system is devised which shows that the Venus data is indicative of the presence of flux ropes whose parameters are the coordinates of the system and would yield the excursions observed in the spacecraft crossings of the fields.

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