2-axis Search-coil Magnetometer


Augsburg College and University of New Hampshire

Scientific objectives
Our search-coil magnetometer is designed to study the coupling of solar wind energy to the magnetosphere and its deposition into the atmosphere, both on the dayside, near the polar cusp/cleft regions, and on the nightside, in the form of aurorae as a result of the substorm process.

This project focuses on the three categories of waves in the middle and upper ULF frequency bands: (1) Pc 1-2 (electromagnetic ion cyclotron) wave generation and propagation, both on closed field lines and in the cusp/LLBL/mantle regions; (2) Pc 3-4 pulsation propagation from its upstream source into and through the dayside magnetosphere and polar cap; and (3) Irregular wave activity in the upper ULF frequency range (Pi 1), which may arise from several sources, as a diagnostic of solar wind magnetosphere coupling and internal magnetospheric instabilities such as substorms.

The ULF measurements with a closely-spaced array (total of four identical magnetometer systems located in Ny Alesund, Longyearbyen, Barentsburg, and Hornsund in Svalbard) provide an opportunity to obtain new insights into the propagation characteristics of these waves.

Co-PI: Mark Engebretson
Address: Department of Physics Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454-1338, USA.
E-mail: engebret@augsburg.edu
Phone/Fax: +1-612-330-1067/+1-612-330-1649

Co-PI: Marc R. Lessard
Address: Space Science Center and Department of Physics, University of New Hampshire, 39 College Road, Durham, NH. 03824, USA.
E-mail: marc.lessard@unh.edu
Phone/Fax: +1-603-862-2590/+1-603-862-0311

Instrument specifications
Magnetic sensor orientation: 2 axes (magnetic N-S and E-W)
Frequency response: DC-5Hz (-3dB)
Magnetic sensor sensitivity: 150 microV/nT * Hz
System sensitivity: 4.43 V/nT * Hz
Dynamic range: +/- 2.26 nT
ADC bit resolution: 1 pT * Hz
System resolution: 10 pT/Hz-2
ADC sampling rate: 10 samples/sec
GPS timing accuracy: 39 msec