Whistler Mode Radio Sounding from IMAGE: Measurement of Electron Density, Ion Effective Mass, and Ion Composition in the Plasmasphere at Low Altitude (~90-3000 km) Along Bo

Details Whistler Mode Radio Sounding from IMAGE: Measurement of Electron Density, Ion Effective Mass, and Ion Composition in the Plasmasphere at Low Altitude (~90-3000 km) Along Bo Whistler Mode Radio Sounding from IMAGE: Measurement of Electron Density, Ion Effective Mass, and Ion Composition in the Plasmasphere at Low Altitude (~90-3000 km) Along Bo

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2148h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2148

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6939] Radio Science / Magnetospheric Physics, [6964] Radio Science / Radio Wave Propagation, [6969] Radio Science / Remote Sensing

Scientific paper

The whistler mode (WM) echoes observed on RPI/IMAGE provide a new method to determine electron density, ion effective mass and composition along the geomagnetic field line Bo from the satellite altitude down to ~90 km [Sonwalkar et.al. 2004, 2011]. More than 2300 WM echoes have been observed on RPI/IMAGE during the period 2000 to 2005 below 5000 km and over all latitudes. We provide here results from the analysis of 12 cases of WM echoes observed within the plasmasphere under quiet to moderate geomagnetic conditions (Kp<5) covering the L-shell range 1.7-4.2. Our analysis shows: (1) The plasma frequency at F2 peak varies from 2 MHz to 6 MHz and altitude varies from ~180 km to ~350 km. (2)O+/ H+ transition height varies from ~700 km to ~1300 km, (3)O+/He+ transition height varies from ~1000 km to ~1300 km. Our measurements compare well with those from DMSP (Ne, O+, H+, H+) at 850 km, and with those from CHAMP (Ne) at 350 km. Relative to WM sounding measurement IRI2007 overestimates Ne by ~20-100% at F2 peak and underestimates Ne by ~30-70% at 2000 km. Transition height for O+/H+, O+/He+ obtained from IRI2007 model are, respectively, ~1.1 to ~1.8 times and ~1.3 to 2 times higher than our model values. Our measurements will lead to an improved empirical model of plasma parameters at low altitude, a region important for ionosphere-magnetosphere coupling.

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