| definition |
- The scientific objectives of the Ulysses Unified Radio and Plasma wave (URAP)
experiment are twofold: l) the determination of the direction, angular size,
and polarization of radio sources for remote sensing of the heliosphere and the
Jovian magnetosphere and 2) the detailed study of local wave phenomena, which
determine the transport coefficients of the ambient plasma. The tracking of
solar radio bursts, for example, can provide three dimensional "snapshots" of
the large scale magnetic field configuration along which the solar exciter
particles propagate. URAP observations of Jovian radio emissions should greatly
improve the determination of source locations and consequently our
understanding of the generation mechanism(s) of planetary radio emissions. The
study of observed wave-particle interactions will improve our understanding of
the processes that occur in the solar wind and at Jupiter and of radio wave
generation. A brief discussion of the scientific goals of the experiment is
followed by a comprehensive description of the instrument. The URAP sensors
consist of a 72.5 m electric field antenna in the spin plane, a 7.5-m electric
field monopole along the spin axis and a pair of orthogonal search coil
magnetic antennas. The various receivers, designed to encompass specific needs
of the investigation, cover the frequency range from DC to l MHz. A relaxation
sounder provides very accurate electron density measurements. Radio and plasma
wave observations are shown to demonstrate the capabilities and limitations of
the URAP instruments: radio observations include solar bursts, auroral
kilometric radiation, and Jovian bursts; plasma waves include Langmuir waves,
ion acoustic-like noise and whistlers.
(Abstract from: R.G. Stone et al., Astron. Astrophys. Suppl. Ser. 92, 291-316,
1992)
For more information, see:
http://urap.gsfc.nasa.gov/www/home.html
and
http://ulysses.jpl.nasa.gov/spacecraft/inst_urap.html
Group: Instrument_Details
Entry_ID: URAP
Group: Instrument_Identification
Instrument_Category: Solar/Space Observing Instruments
Instrument_Class: Radio Wave Detectors
Short_Name: URAP
Long_Name: Unified Radio and Plasma Wave Experiment (Ulysses)
End_Group
Group: Instrument_Associated_Sensors
Short_Name: SND
Short_Name: FES
Short_Name: WFA
Short_Name: PFR
Short_Name: RAR
End_Group
Group: Associated_Platforms
Short_Name: ULYSSES
End_Group
Group: Spectral_Frequency_Information
Wavelength_Keyword: Radio
Number_Channels: 4
Spectral_Frequency_Coverage_Range: 1.25 kHz - 1 MHz
End_Group
Online_Resource: http://urap.gsfc.nasa.gov/www/home.html
Online_Resource: http://ulysses-ops.jpl.esa.int/ulysses/archive/urap.html
Sample_Image: http://ulysses-ops.jpl.esa.int/ulysses/images/sto_6.jpg
Group: Instrument_Logistics
Data_Rate: 145 kbps
Instrument_Start_Date: 1990-10-06
Instrument_Owner: NASA
End_Group
End_Group
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