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1040 - ARM - Arecibo P.R. MST Radar
Instrument Type: Instrument > Radar > MiddleAtmosphereRadar > MSTRadar
Observatory: None
Observation Site: ARM - Arecibo P.R. MST Radar
Operating Mode:

Instrument Page: ARM

Description:
The ST (strato/troposphere) radar at the National Astronomy and Ionosphere Center (NAIC) at Arecibo, Puerto Rico (18.3N, 66.75W), made measurements during the AIDA (Arecibo Initiative in Dynamics of the Atmosphere) campaign of March-May, 1989, an international multi-instrument campaign which was conducted to compare wind measurements in the mesosphere taken by various radar and optical devices. The tropo- and stratosphere data taken by the Arecibo ST radar during this period were largely decoupled from the main objectives and the observations of the other instruments. Data are available for both day and night times. Integration time per profile varies and is on the order of 30 sec to 1 min. However, because the mesosphere observations were interleaved with this data set, there are many gaps between profiles on the order of a few minutes. During AIDA, the altitude range sampled was from about 5 to 20 km, and the resolution was about 0.3 km. For this data set, the antenna azimuth scan pattern was very roughly as follows: 1.5 hrs at 14 or 32 deg, 10 min at -76 or -58 deg, 10 min at 194 or 212 deg, 30 min at 104 or 122 deg, 10 min at 194 or 212 deg, and 10 min at -76 or -58 deg, then repeat. Beware that the times do appear to vary. Elevation angle was fixed at about 79 degrees. Results from AIDA have been published in J. Atmos. Terr. Phys., 55, 1993, a special issue dedicated to the campaign. H. Mario Ierkic was responsible for the operation of the Arecibo ST radar during AIDA, and John Cho put this data set into the CEDAR Data Base. This program extracts the following data from the Doppler spectra of the Arecibo ST radar: (1) Line-of-sight velocity of the clear air, (2) signal spectral width, and (3) SNR. Item (1) is self-explanatory. Items (2) and (3) yield information about the actual radar scattering mechanism. If the mechanism is turbulence, then (1) and (3) yield the turbulence intensity. For further information see Gage and Balsley [1980].

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