Disturbances of the western European ionosphere during the total solar eclipse of 11 August 1999 measured by a wide ionosonde and radar network

摘要: Abstract The 11 August 1999 Solar eclipse totality path ran across western Europe at near-constant latitudes of about 49°N. It occurred mid-time a sequence three days with steady solar wind and quiet magnetospheric conditions. Its response was observed by score ionospheric facilities, which will provide high-resolution probing the various disturbances. First results allow us to compare time fluctuations distances from on adjacent days, inside 5° West East longitude area. In this preliminary work foF1 foF2 changes are presented in contour maps 50 km size grid. They show expected transit perturbation. We venture brief comments eclipse-own signatures as separate wave oscillations detected prior 12.4 MHz panoramic azimuth scans Losquet radar near Lannion (Brittanny).