Evaluations of the impedance probe measurements in the ionosphere and its application to plasma diagnostics

Details Evaluations of the impedance probe measurements in the ionosphere and its application to plasma diagnostics Evaluations of the impedance probe measurements in the ionosphere and its application to plasma diagnostics

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa23a1465s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA23A-1465

Computer Science

Sound

[2467] Ionosphere / Plasma Temperature And Density, [2494] Ionosphere / Instruments And Techniques, [6994] Radio Science / Instruments And Techniques

Scientific paper

The impedance probe is a powerful tool to measure the electron density. The frequency variations of the probe impedance give upper hybrid resonance (UHR) frequency. We can accurately determine the electron density from the UHR frequency. In addition to the UHR frequency, the probe impedance in ionospheric plasmas shows characteristic variations. Especially, the ion sheath surrounding the probe significantly affects the probe impedance. In this presentation, we will discuss the instrumental development for the next sounding rocket observation and evaluations of the probe impedance via electron hybrid simulations. The sheath capacitance is a useful parameter to the ionospheric plasma diagnostics. The impedance probe onboard the sounding rocket demonstrated that the Debye length of the Maxwellian plasma can be estimated from the sheath capacitance (Oya and Aso, 1969; Suzuki et al., submitted). The measurements of the sheath capacitance do not require the frequency sweep in contrast to the detection of the UHR frequency. For the next sounding rocket experiment, we design the impedance probe instrument to measure the sheath capacitance frequently. The improvement realizes both the high time resolution measurements from the sheath capacitance and the high accurate measurements from the UHR frequency. We will show the concept of the instrument. We also perform electron hybrid simulations in order to evaluate the impedance probe measurements including the effect of the ion sheath. Since the ion sheath significantly modifies the probe impedance at lower frequencies in comparison to that around the UHR frequency, it is necessary to take into account the effect of the sheath in evaluating the probe impedance. We develop a particle-in-cell code based on the electron hybrid code, which treats cold electrons as fluid and hot electrons as particles (Katoh, 2003), so as to consider the formation of the ion sheath. We will report on the present state of the electron hybrid simulations of the impedance probe measurements.

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