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- W2000535206 abstract "In this paper the question is examined of how the v.l.f. radio-waves are guided along the magnetic field. Energy passes through the magnetic field under two sets of conditions. Corresponding to the “nose-whistlers” explained by Helliwell, the first one occurs when the wave-normal itself is in the direction of the magnetic field. This does not happen in the second case when the remarkable property is also shown that all frequencies are propagated at the same velocity V0 = cƒH/2ƒ0 (ƒH gyrofrequency, ƒ0 frequency of the plasma). Considerations of energy point out that, if such a propagation is not easily observable in the case of an isotropic emission, it is not the same thing for an emission produced by Čerenkov effect, which is able to produce all energy by this mode of propagation, provided the particle's velocity has a low fixed value (~ 10,000 km/sec in the exosphere). All frequencies being emitted at the same time and following the same path wtih the same velocity, we can explain the broadband noise observed during the reception of whistlers. The required velocity of particles is exactly the velocity V0. This coincidence is explained in an appendix, and extended to other anisotropic media. On étudie le guidage des ondes de très basse fréquence par le champ magnétique. On montre que l' énergie peut se propager le long du champ magnétique dans deux cas. Le premier, qui correspond aux “nose-whistlers” interprétés par Helliwell, est celui dans lequel la normale à l'onde de phase est elle-même dirigée suivant le champ magnétique. Il n'en est pas de même dans le second cas qui possède par ailleurs la propriété remarquable que toutes les fréquences se propagent à la même vitesse V0 = cƒH/2ƒ0 (ƒH gyrofréquence, ƒ0 fréquence de plasma). Des considérations d'énergie montrent que si une telle propagation est difficilement observable dans le cas d'une émission isotrope, il n'en est pas de même dans le cas d'une émission produite par effet Čerenkov. On montre qu'au contraire il existe une vitesse des particules (~ 10,000 km/s dans l'exosphère) permettant d'émettre toutes les fréquences dans ce mode. On a ainsi une explication possible des bruits à large bande observés dans l'écoute des whistlers. La vitesse nécessaire des particules est justement la vitesse V0. Une explication de cette coïncidence est donnée en appendice. Elle se généralise à d'autres milieux anisotropes." @default.
- W2000535206 created "2016-06-24" @default.
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- W2000535206 date "1961-08-01" @default.
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- W2000535206 title "Le guidage des whistlers par le champ magnetique" @default.
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- W2000535206 doi "https://doi.org/10.1016/0032-0633(61)90096-4" @default.
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