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

<https://gcmd.earthdata.nasa.gov/kms/concept/6c5ca722-0bc7-4ccd-ad24-39b9d8710140>
  skos:prefLabel "Radar Sounders"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/62309600-7c79-4ae1-a232-9f968bd81ac3> .

<https://gcmd.earthdata.nasa.gov/kms/concept/62309600-7c79-4ae1-a232-9f968bd81ac3>
  skos:changeNote """2013-06-17 10:24:34.0 [saritz] Move Concepts 
add narrower relation (MST [62309600-7c79-4ae1-a232-9f968bd81ac3,74935] - WCR [f41e9e06-c769-46ed-a79c-2ff2184eee4a,105241]); 
""", """2013-06-17 10:24:47.0 [saritz] Move Concepts 
delete narrower relation (null); 
""" ;
  ns0:altLabel [ ] ;
  skos:definition """The mission of the NERC MST Radar Facility at Aberystwyth is to
provide high-quality atmospheric data products to the UK
academic community in support of environmental research and
education. The data are freely available through the British
Atmospheric Data Centre (BADC).

The MST (Mesosphere-Stratosphere-Troposphere) Radar at Capel
Dewi (near Aberystwyth in West Wales, UK) is a 46.5 MHz pulsed
Doppler radar ideally suited for studies of atmospheric winds,
waves and turbulence. It is run almost exclusively in the
ST-mode for which MST radars are unique in their ability to give
continuous measurements of the three-dimensiuonal wind vector
over the altitude range 2 - 20 km at resolutions of a few
hundred metres in altitude (typically 300 m) and a few minutes
in time (typically 2-3 mins). Additionally, under certain
circumstances, the radar returns can give information about the
atmospheric static stability (thus allowing for monitoring of
the altitude and sharpness of the tropopause), humidity fields
and turbulence (of at least moderate intensity).

Technical Information:

1. Operating frequency/radar wavelength
46.5 MHz/6.45 m

2. Peak transmitted power
160 kW (from 5 Tycho Technology WPT-50 transmitters)

3. Transmitter pulse lengths, us (range resolutions, m)
1 (150), 2 (300), 4 (600), 8 (1200), 16 (2400), 32 (4800)

4. Complementary pulse coding available for 4 us and longer pulses
Inter-pulse periods, us (maximum unambiguous ranges, km)
80 (12), 160 (24), 320 (48), 640 (96)

5. Maximum duty cycle
5 %

6. Antenna type
20 ?~ 20 array of 4-element Yagis, 0.85 ?É spacing

7. Antenna dimensions
109.6 ?~ 109.6 m

8. Location of the antenna arrray
Latitude 52.42??N, Longitude 4.01??W, 50 m above mean sea level
British National Grid Reference SN 637 826

9. Available beam pointing directions
N4.2??, E4.2??, S4.2??, W4.2??
NE6??, SE6??, SW6??, NW6??,
N8.5??, E8.5??, S8.5??, W8.5??
NE12??, SE12??, SW12??, NW12??

where the actual azimuths are offset 17.5 ??, anticlockwise from
the nominal directions

10. Minimum coherent integration time
81.92 ms

11. Avaialble DFT lengths
64, 128, 256, 512

Additional information available at
"http://mst.nerc.ac.uk/"

[Summary provided by National Environment Research Council]"""@en ;
  skos:prefLabel "MST"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/6c5ca722-0bc7-4ccd-ad24-39b9d8710140> ;
  a skos:Concept .