Addition de Trois Nombres à Un Chiffre (Grand Format)

tions of enhancements in the electron density of the ionospheric F-region created by cusp/cleft particle precipitation at the dayside entry to the polar-cap convection

We have observed a number of strong short-lived echoes with the EISCAT UHF radar at angles 83.5° and 78.6° with the geomagnetic field and at about 100-km altitude north in the

striking to see that the ratio R is smallest on April 16, when the strength of the cyclone is maximal, and largest on April 17, when the cyclone has weakened. The ratio between the

Indeed, this assumption may not be unrealistic, because the region of the particle injections that occurred in association with the Pi 2 onset was reported to span 5 h of local

As we have shown with the model results for the second case the amplitude and phase of the electric ®eld components are in qualitative agreement with experi- mental data for

Despite the diculties in determining the exact variation in ¯ow angle across the ®eld of view, even an approximate estimate allows the ¯ow-angle dependence of the

The zonal ¯ow associated with the unperturbed east±west component (which includes the corotation ¯ow) then adds a weak eastward ¯ow in the dusk sector which reverses to a weak

On the other hand, deep into the magnetosphere, upstream waves are also expected to trigger eigenos- cillations of the local ®eld lines (Yumoto and Saito, 1983), if the source