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Equivalent Circuit Model for the Electric Field Sensitivity of a Magnetic Search Coil of Space Plasma


AuthorOzaki, Mitsunori; Yagitani, Satoshi; Takahashi, Ken; Imachi, Tomohiko; Koji, Hiroki; Higashi, Ryoichi;
Keywordselectric field sensitivity; Magnetic search coils; sheath impedance; space plasmas
AbstractMagnetic search coils (MSCs) are sensitive to both magnetic and electric fields, but detecting electric fields is unnecessary for magnetic observations of plasma waves. However, it is important to evaluate both sensitivities for different geometries and electrostatic shields to avoid electric field pickup. An equivalent circuit model for the electric field sensitivity of an MSC in a collisionless isotropic cold plasma is developed here using electrical coupling through a sheath capacitance. That sensitivity is defined by a relationship between the MSC impedance and the sheath capacitance. To confirm the validity of the circuit model, the sensitivity to an electric field is measured by imposing an external electric field using charged parallel metallic plates in laboratory experiments. The coupling capacitance between the MSC and the charged plates is equivalent to the sheath capacitance in a space plasma. The measured results show good agreement with an approximate expression deduced from the equivalent circuit model.
Year of Publication2014
JournalIEEE Sensors Journal
Volume
Number of Pages1-1
Section
Date Published10/2014
ISBN
URLhttp://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6937067
DOI10.1109/JSEN.2014.2365495