Ion Drift and Electric Field Measurement Capabilities of the Canadian Suprathermal Ion Imager

Details Ion Drift and Electric Field Measurement Capabilities of the Canadian Suprathermal Ion Imager Ion Drift and Electric Field Measurement Capabilities of the Canadian Suprathermal Ion Imager

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa31a0352k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA31A-0352

Computer Science

Sound

0358 Thermosphere: Energy Deposition (3369), 2411 Electric Fields (2712), 2494 Instruments And Techniques

Scientific paper

The Suprathermal Ion Imager (SII) is a hemispherical electrostatic analyzer capable of producing images of 2-D cuts through low-energy (0-20 eV, typically) ion distribution functions. Distributions can then be reduced to produce estimates of ion drift, temperature, density, and anisotropies. We present past and planned precision measurements of ion drift. Measurements from the Cusp2002 and JOULE sounding rocket missions show the SII's ability to resolve ion drifts of order 10 m/s, including low-altitude ion outflows seen in the dayside cusp ionosphere, and upwelling ions seen between 120-150 km altitude inside an auroral arc in the midnight sector. A modified version of the SII is being developed for the ESA Swarm mission, consisting of three, three-axis stabilized satellite payloads optimized for precise measurements of magnetic and electric fields. The SII-based Canadian Electric Field Instrument will measure the 3-D ion drift with 1-sigma resolution and accuracy of 5 and 50 m/s, respectively. The corresponding resolution and accuracy are 0.3 and 3 m/s for electric fields. Electric and magnetic field measurements combined will produce estimates of Poynting flux to a resolution of 1 μW/m2, making Swarm an unprecedented tool for M-T-I coupling studies. The three Swarm satellites will have nearly polar, circular orbits between 300-530 km during a four-year mission beginning in 2009.

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