Standing wave patterns in VLF hiss

Computer Science – Sound

Scientific paper

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7

Hiss, Ionospheric Propagation, Lower Ionosphere, Rocket Sounding, Standing Waves, Very Low Frequencies, E Region, Ionospheric Sounding, Propagation Modes, Refractivity, Specular Reflection, Wave Dispersion, Whistlers

Scientific paper

The present investigation is concerned with the observation of some unusual VLF electric and magnetic fluctuations measured from three sounding rockets in the altitude range from 90 to 140 km. An interference pattern caused by reflection of broadband VLF hiss from a fairly sharp layer at about 90 km altitude has been observed on a rocket on both upleg and downleg of two flights and on the upleg of a third flight. The obtained results indicate the presence of a refractive index gradient. In connection with the sharpness of the refractive index gradient, the reflection may be assumed to be specular. A constant or almost constant wave vector direction for the incident waves may also be assumed.

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