Radio seeing through the interplanetary medium.
Abstract
Radio astronomical observations made from the Earth are affected by turbulence in the interplanetary medium which may the limiting factor at low frequencies and long baselines. The fringe visibility measured by an interferometer is reduced by an extent which depends on the frequency of the observation, the solar elongation, the baseline, the integration period, and the general conditions prevailing within the interplanetary medium at that moment. The author presents an operational formula for observers who wish to know quickly the likely magnitude of the effect of the medium on their observations, and describes how daily synoptic maps made at Cambridge may be used to locate regions of expecially bad or good seeing.
- Publication:
-
URSI/IAU Symposium on Radio Astronomical Seeing
- Pub Date:
- 1990
- Bibcode:
- 1990ursi.symp..229D
- Keywords:
-
- Interplanetary Medium;
- Radio Astronomy;
- Seeing (Astronomy);
- Interferometers;
- Low Frequencies;
- Space Observations (From Earth);
- Synoptic Meteorology;
- Astronomy;
- Interplanetary Matter: Seeing;
- Interplanetary Matter: Radio Radiation;
- Interplanetary Matter: Turbulence