Studying the connection between the ionosphere and plasmasphere using GPS observations

Details Studying the connection between the ionosphere and plasmasphere using GPS observations Studying the connection between the ionosphere and plasmasphere using GPS observations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm52c..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM52C-02

Physics

0994 Instruments And Techniques, 2431 Ionosphere/Magnetosphere Interactions (2736), 2730 Magnetosphere: Inner, 2768 Plasmasphere

Scientific paper

Studying plasmaspheric dynamics during and after magnetic storms provides information on how the plasmasphere responds to and influences storm evolution, and provides insight into magnetosphere-ionosphere coupling. Understanding the source and loss processes of ring current and radiation belt particles requires a dynamic picture of the plasmaspheric mass density, which modifies those populations by particle-particle and indirectly by wave-particle interactions. Studies using plasmaspheric measurements from the IMAGE satellite and ionospheric total electron content measurements from ground-based GPS receivers have demonstrated a striking correlation between stormtime density enhancements in the ionosphere and plasmaspheric drainage plume structure caused by enhanced magnetospheric convection. We describe how the continuous dual-frequency L-band transmissions from 27 Global Positioning Satellites (1.2 and 1.5 GHz), orbiting at about 4 Earth radii, are important observational tools for studying the plasmasphere and ionosphere as a coupled system. Total electron content measurements from ground-based GPS receiver networks are complementary to measurements obtained from zenith-viewing GPS receivers in low-Earth orbit, currently available from a variety of altitudes both within and above the ionosphere. We will report on observed trends such as the plasmaspheric content versus latitude, how this evolves over several hours during a magnetic storm, apparent refilling of the plasmasphere after a storm, and how the plasmasphere structure correlates with ground and space-based GPS measurements of the ionosphere. Since GPS measurements of the plasmasphere are fairly new, we will discuss the measurement system itself, limitations and possible new directions.

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