Magnetic Field/Electric Field Instruments
ULYSSES-FGM
A fundamental feature of the heliosphere is the three dimensional structure of the interplanetary magnetic field. The magnetic field investigation on Ulysses, the first space probe to explore the out-of-ecliptic and polar heliosphere, aims at determining the large scale features and gradients of the field, as well as the heliolatitude dependence of interplanetary phenomena so far only observed near the ecliptic plane. The Ulysses magnetometer uses two sensors, one a Vector Helium Magnetometer, the other a Fluxgate Magnetometer. Onboard data processing yields measurements of the magnetic field vector with a time resolution up to 2 vectors/second and a sensitivity of about l0 pT. Since the switch-on of the instrument in flight on 25 October l990, a steady stream of observations have been made, indicating that at this phase of the solar cycle the field is generally disturbed: several shock waves and a large number of discontinuities have been observed, as well as several periods with apparently intense wave activity. The paper gives a brief summary of the scientific objectives of the investigation, followed by a detailed description of the instrument and its characteristics. Examples of wave bursts, interplanetary shocks and crossings of the heliospheric current sheet are given to illustrate the observations made with the instrument. (Abstract from: A. Balogh et al., Astron. Astrophys. Suppl. Ser. 92, 221-236, 1992) For more information, see: http://www.sp.ph.ic.ac.uk/Ulysses/ and http://ulysses.jpl.nasa.gov/spacecraft/inst_vhm_fgm.html Group: Instrument_Details Entry_ID: FGM-U Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Magnetic Field/Electric Field Instruments Short_Name: FGM-U Long_Name: Ulysses Flux Gate Magnetometer End_Group Group: Associated_Platforms Short_Name: ULYSSES End_Group Online_Resource: http://www3.imperial.ac.uk/spat/research/space_missions/ulysses/magnetometer/instrument_description Online_Resource: http://ulysses-ops.jpl.esa.int/ulysses/archive/vhm_fgm.html Sample_Image: http://ulysses-ops.jpl.esa.int/ulysses/images/vhm.jpg Group: Instrument_Logistics Data_Rate: 50 kbps Instrument_Start_Date: 1990-10-06 Instrument_Owner: Imperial College, London End_Group End_Group