Increased Magnetospheric fpe}/f{ce Values in Response to Magnetic-Cloud Enhancements of the Solar-Wind Quasi-Invariant on 31 March 2001

Details Increased Magnetospheric fpe}/f{ce Values in Response to Magnetic-Cloud Enhancements of the Solar-Wind Quasi-Invariant on 31 March 2001 Increased Magnetospheric fpe}/f{ce Values in Response to Magnetic-Cloud Enhancements of the Solar-Wind Quasi-Invariant on 31 March 2001

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31b0758o&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31B-0758

Physics

2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms, 6984 Waves In Plasma

Scientific paper

The Radio Plasma Imager (RPI) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite normally observes a large number of plasma resonances at the harmonics of the electron cyclotron frequency fce in the apogee portion of the IMAGE orbit where fce is usually quite small (a few kHz). These resonances, which are usually the only ones observed in this region, are often observed most prominently on the spin-axis Z antenna. During the large disturbance of 31 March 2001, however, this situation changed dramatically. The value of fce increased considerably (by about a factor of 2), indicating a similar increase in the magnetic field strength, and the electron plasma frequency fpe (proportional to the square root of the electron density) increased by an even larger factor. The resulting plasmagrams near apogee on this day revealed about half as many fce resonances as are normally observed and a rich spectrum of additional resonances due to the increase in the fpe value. We will relate these increases to the large (more than a factor of 10) enhancement of the solar-wind quasi-invariant associated with this disturbance. We will demonstrate the importance of being able to relate the changes in the magnetospheric fpe}/f{ce ratio (equivalent to the ratio of the electron gyro radius to the Debye length) to changes in the solar wind as measured by the solar-wind quasi-invariant.

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