Possible contribution of a solar transient to enhanced scintillation of a quasar

Details Possible contribution of a solar transient to enhanced scintillation of a quasar Possible contribution of a solar transient to enhanced scintillation of a quasar

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992em%26p...58...31j&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 58, no. 1, p. 31-38.

Computer Science

Comet Tails, Quasars, Scintillation, Solar Position, Halley'S Comet, Power Spectra, Shock Fronts, Space Plasmas

Scientific paper

Observations of the quasar 2314 + 038 were carried out during 16-21 December, 1985 at a solar elongation around 85 deg, when the plasma tail of Comet Halley swept in front of it. These observations have shown a two-fold increase in scintillation index as compared to the expected levels of scintillation for the source, computed using the well-known RKH (Readhead et al., 1978) model. Spacecraft data and the geomagnetic indices available during the period show that a shock-front had reached the earth on the 18 December, the day when maximum increase in scintillation was recorded. The possible contribution of such a shock-front to the enhancement has been shown to be not greater than 15 percent. Hence, the major contribution to the enhancement came from the plasma tail of a comet.

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