Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8910676p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 1, 1984, p. 10676-10684.
Physics
55
Planetary Ionospheres, Planetary Magnetic Fields, Solar Planetary Interactions, Solar Wind, Venus Atmosphere, Dynamic Pressure, Flow Velocity, Ionopause, Magnetosheath, Pioneer Venus 1 Spacecraft, Time Series Analysis
Scientific paper
Observations from the Pioneer Venus orbiter magnetometer reveal the presence of large-scale magnetic fields in the dayside ionosphere during or after periods of high solar wind dynamic pressure. Various hypotheses have been proposed concerning the spatial and temporal evolution of these field structures. The hypothesis that the field is produced by a diffusion/convection process rather than by currents driven by electric fields resulting from the solar wind interaction is examined. Dynamic pressure variations occur on various time scales at Venus, producing transient and quasi-steady magnetization features. A one-dimensional diffusion/convection calculation is performed, using typical ionopause field and pressure values for a variety of altitudes. The Venus ionopause is considered to be the altitude at which ionospheric thermal pressure is equal to the magnetosheath magnetic pressure, which in turn is well correlated with the normal component of solar wind dynamic pressure. A subsolar model of downward plasma velocity in the 140-290 km range is used. The calculated growth of the ionospheric magnetic field, and the resulting quasi-steady altitude profiles, compare favorably with the observed profiles. The majority of the observed magnetic structures are best explained as the quasi-steady effects of the prevailing solar wind dynamic pressure, which determines the altitude and magnetic field strength of the ionopause boundary.
Luhmann Janet G.
Phillips John Lynch
Russell Christopher T.
No associations
LandOfFree
Growth and maintenance of large-scale magnetic fields in the dayside Venus ionosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Growth and maintenance of large-scale magnetic fields in the dayside Venus ionosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Growth and maintenance of large-scale magnetic fields in the dayside Venus ionosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-737033