The Sun is an active source of radio emission which is often associated with the acceleration of electrons arising from processes such as solar flares and coronal mass ejections (CMEs). At low radio frequencies (
Whistlers are electromagnetic waves generated by lightning discharges traveling through the ionosphere where the dispersion relations show that the higher frequency emissions travel faster than the low frequency emissions. Satellite analog wave receivers allowed the Very Low Frequency (VLF) (less th...
A narrowband receiver was installed at the SANAE IV base in Antarctica to monitor specific very low frequency (VLF) radio signals from transmitters around the world. VLF waves propagating through the Earth-Ionosphere Waveguide are excellent probes of the varying properties of the lower region of the...
La Cité des sciences et le CNRS Images ont édité un DVD qui contient 21 séquences de 1 min 30 s, chaque séquence présentant une image scientifique, fixe ou animée en la décryptant : conditions d'obtention, sens de l'image, intérêt pour le chercheur. On présente ici une sélection de 5 ces séquences....
Bureau R. Les éruptions chromosphériques du soleil et le magnétisme terrestre. In: Bulletin de l'Institut d'Egypte, tome 20, fascicule 2, 1937. pp. 163-167.