Field Investigation: Instrumentation and Preliminary Scientific
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.
from: A. Balogh et al., Astron. Astrophys. Suppl. Ser. 92,
Team Home Page
to Description of Instruments