Concept information
Preferred term
BROADBEAM RIOMETERS
Definition
- Riometer is a radio receiver used for monitoring the intensity of cosmic radio noise. Riometer is, in principle, a sensitive, calibrated radio receiver which measures the signal strength of the weak radio signals received from the sky. The riometer technique for examining electron density enhancements in the ionosphere is based on the absorption of cosmic radio noise, the broadband RF energy radiated by stellar sources in the galaxy. Riometer record the noise coming to earth from the sky by using narrow beam antennas, with beamwidths of 10 to 20 degrees, are sensitive to smaller scale features of ionization, it rejects noise coming in from sources on the ground and responds mostly to signals coming from outside the ionosphere. The data from several riometers operated at different frequencies, but examining the same sky with broadbeam antennas, show effects which have been interpreted as being due to small scale spatial structure in the electron precipitation region, which does not completely fill the antenna beam. (en)
Broader concept
- Radio Wave Detectors (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/520ebc89-b977-4502-a2c8-e7ca07a55b19
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