@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/0f65098b-489c-41bf-a6ef-41ce5fb2310a>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """The SWAN (Solar Wind ANisotropies) instrument is one of twelve instruments
onboard SOHO (SOlar Heliospheric Observatory) satellite. It is a collaboration
between Finnish Meteorological Institute and Service d'Aeronomie. Technical
Research Centre of Finland was responsible for the construction, mechanics,
thermal design, and central processor of the instrument itself.

A solar Lyman alpha radiation is scattered by hydrogen atoms, which flow into
the solar system. The scattered radiation is called interplanetary Lyman alpha
radiation. SWAN observes interplanetary Lyman alpha radiation from all
directions of the sky. Usually SWAN observes three radiation maps of the whole
sky per week. In each map the radiation is strongest near the inflow direction
of the interstellar hydrogen gas. However, the overall picture of the sky has
changed considerably from the solar minimum 1996 to the solar maximum.
Theoretical results have shown that this kind of a change can be caused by the
solar wind proton flux which varies according to the distance to the
heliospheric current sheet.

For more information, see:
http://www.fmi.fi/research_space/space_7.html
and
http://www.aero.jussieu.fr/experience/SWAN/


Group: Instrument_Details
   Entry_ID: SWAN
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Particle Detectors
      Short_Name: SWAN
      Long_Name: Solar Wind Anisotropies
   End_Group
   Group: Associated_Platforms
      Short_Name: SOHO
   End_Group
   Group: Spectral_Frequency_Information
      Wavelength_Keyword: Ultraviolet
      Number_Channels: 1
      Spectral_Frequency_Coverage_Range: 115-180 nm
      Spectral_Frequency_Resolution: 0.001 nm
   End_Group
   Online_Resource: http://www.aero.jussieu.fr/experience/SWAN/
   Online_Resource: http://www.fmi.fi/research_space/space_7.html
   Sample_Image: http://www.fmi.fi/img/en/research/space/link/swan.jpg
   Group: Instrument_Logistics
      Data_Rate: 0.2 kbps
      Instrument_Start_Date: 1995-12-02
      Instrument_Owner: Finnish Meteorological Institute
      Instrument_Owner: Service d'Areonomie, France
   End_Group
End_Group"""@en ;
  skos:prefLabel "SWAN"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/5f5e4f2c-61b7-4694-8680-3fc5799f6171>
  skos:prefLabel "Particle Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/0f65098b-489c-41bf-a6ef-41ce5fb2310a> .