Faraday Rotation Measurements Over Three Cassini Solar Conjunctions

Details Faraday Rotation Measurements Over Three Cassini Solar Conjunctions Faraday Rotation Measurements Over Three Cassini Solar Conjunctions

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh31a..02j&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH31A-02

Astronomy and Astrophysics

Astrophysics

6900 Radio Science, 7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields

Scientific paper

We use radio science data collected from the solar coronal occultation of the Cassini spacecraft in 2002, 2003 and 2005 to measure Faraday rotation. Faraday rotation is the rotation observed in the plane of polarization of an EM wave passing through a magnetized medium. It is proportional to the integrated product of the electron density and the background magnetic field parallel to the radio frequency wave vector. We compare the Faraday rotation measurements to our model; our model combines the Tyler et al. (1976) electron density model and a Potential Field Source Surface model using Wilcox Solar Observatory spherical harmonic coefficients. We find that our Faraday rotation model resembles the steady background measurements. Notable events during the experiments include streamers, waves, and CMEs crossing the line of sight. In 2002 the closest approach of the signal to the surface of the sun was 0.75 solar radii; the closest approach was closer in 2003 (0.5 Rs) and again in 2005 (0.16 Rs). Our Faraday rotation model includes the option of a constant-alpha force-free flux rope intersecting the line of sight. Notable Faraday rotation behavior has been reproduced with this model including the disturbance displacing the measurements either entirely above or below the background Faraday rotation and the characteristic 'W' signature. We discuss the variables contributing to the behavior including intersecting colatitude and longitude angles, size, velocity, expansion, and twist.

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