IPS activity observed as a precursor of solar induced terrestrial activity

Details IPS activity observed as a precursor of solar induced terrestrial activity IPS activity observed as a precursor of solar induced terrestrial activity

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978omap....1.....c&link_type=abstract

In AGARD Operational Modelling of the Aerospace Propagation Environ., Vol. 1 and 2 17 p (SEE N79-18094 09-31)

Astronomy and Astrophysics

Astronomy

Electron Density Profiles, Geomagnetism, Interplanetary Medium, Radio Sources (Astronomy), Radio Telescopes, Solar Terrestrial Interactions, Solar Wind, Ionospheric Disturbances, Magnetic Disturbances, Plasma Density, Radio Waves, Solar Activity

Scientific paper

A radio telescope designed to exploit the interplanetary scintillation (IPS) technique and locate, map, and track solar wind disturbances which result in geomagnetic disturbances, thereby providing a forecast capability, is described. Preliminary results from operation of the telescope include: (1) evidence for a precursor signal in the IPS activity with a 1-2 day lead time with respect to density enhancements which frequently give rise to geomagnetic activity; (2) detection of a spectral broadening signature which also serves as a precursor of geomagnetic activity; (3) out-of-the-ecliptic plasma density enhancements which were not detected by near-Earth, ecliptic plane spacecraft; (4) detection of 12 corotating density enhancements;(5) detection of over 80 sources which give detectable scintillation of which 45 have been used for detailed synoptic analysis and 9 for spectral analysis; and (6) measurement of 0-lag coefficient of 0.56 between density and IPS activity enhancements.

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