Aerodynamic Influence on Plama Impedance Probe Measurements in Sounding Rocket Missions

Statistics – Computation

Scientific paper

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7855 Spacecraft Sheaths, Wakes, Charging

Scientific paper

Plasma instrument measurements on sounding rockets are affected by the aerodynamics of the spacecraft body. The effects of density gradients and wake effects on the impedance of a dipole antenna for a sounding rocket mission are analyzed. A DSMC/PIC code is used to simulate the aerodynamic conditions encountered during three sounding rocket missions, the Sudden Atom Layers (SAL) mission, the Tropical Storms mission and the Equatorial Ionospheric Study (Equis)-II mission. Impedance data is analyzed using a Plasma Fluid Finite Difference Time Domain (PF-FDTD) simulation, which is a multi-species finite difference computational model of an antenna immersed in a homogeneous plasma. The PF-FDTD code is modified to include the effects of density gradients introduced by the flow structure around a spacecraft. The plasma frequency and upper-hybrid frequencies measured by the impedance probe are seen to be affected by the spacecraft wake. Estimates are obtained for the correction coefficients that are to be applied in order to account for spin- modulation effects on the electron density measurements.

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