Application of Whistler- and Z- Mode Radio Sounding to the Determination of Plasma Density, Ion Effective Mass and Composition, and Ducts in the Inner Magnetosphere

Details Application of Whistler- and Z- Mode Radio Sounding to the Determination of Plasma Density, Ion Effective Mass and Composition, and Ducts in the Inner Magnetosphere Application of Whistler- and Z- Mode Radio Sounding to the Determination of Plasma Density, Ion Effective Mass and Composition, and Ducts in the Inner Magnetosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2149s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2149

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [6964] Radio Science / Radio Wave Propagation, [6969] Radio Science / Remote Sensing, [7954] Space Weather / Magnetic Storms

Scientific paper

Application of whistler mode [Sonwalkar et al., 2004, 2011] and Z mode [Carpenter et al., 2003] radio sounding has led to new measurements, along the geomagnetic field, of electron density, ion effective mass (meff) and composition (H+, He+, O+) , and of plasma density ducts in the inner magnetosphere. Using whistler mode echoes from radio sounding at 6-63 kHz, electron density and ion compositions are measured at altitudes (~90 - 3000 km) for invariant latitude 40 o to 60 o (L=1.7-4.2). Our measurements compare well with those from DMSP and CHAMP. Relative to whistler mode sounding measurements IRI2007 model overestimates Ne by ~20-100% at F2 and underestimates Ne by ~30-70% at 2000 km. A study of the variation of plasma parameters during the development of a storm, from quiet conditions and subsequent recovery, shows that relative to the preceding quiet time the ion effective mass increases and the electron density first increases and then decreases during the storm time. The O+-H+ transition height during the preceding quiet time is ~1150 km, during the subsequent recovery period it increased to ~ 1600 km and then at the end of the recovery period it decreased to ~840 km. Z mode echoes from radio sounding at 50-1000 kHz are used to determine the parameters of Z mode ducts at mid latitudes. Analysis of ducted fast Z mode echoes observed on 10 January 2005 (L = 2.7, Alt = ~1750 km, MLT=17.2) shows that a duct of half-width ΔL = 0.06 (~78 km at 1750 km) and density depletions of ~45%, covering the altitude range ~ 1,300 - 10,000 km is required to trap Z mode waves. The significance of our results lies in its focus upon probing an altitude region (<5000 km) that is important for understanding the effects of solar variability on the Earth's magnetosphere and ionosphere, and which is also elusive in terms of accessibility for measurement by previously applied methods.

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