Study of some unusual VLF emissions
Study of some unusual VLF emissions
- Author(s): B. Delport and A.B. Collier
- DOI: 10.1049/cp.2009.0088
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- Author(s): B. Delport and A.B. Collier Source: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009), 2009 p. 319 – 322
- Conference: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009)
- DOI: 10.1049/cp.2009.0088
- ISBN: 978 1 84919 123 4
- Location: Edinburgh, UK
- Conference date: 28-30 April 2009
- Format: PDF
The study of very low frequency (VLF) emissions has been conducted for many years, and has resulted in numerous publications. A few emission types, such as whistlers (electromagnetic signals generated by lightning, and dispersed on their path through the magnetosphere) and chorus (the result of Doppler shifted cyclotron resonance interactions in the magnetosphere), are already well understood. However, many other emissions are not well explained, mainly due to their infrequent occurrence. These emissions typically occur at frequencies below 4 kHz, can be periodic (with periods mostly in the range 2 s to 5 s), and are believed to be generated by some form of instability. These extraordinary emissions, as well as geomagnetic conditions at the time of their occurrence, are discussed.
Inspec keywords: magnetospheric electromagnetic wave propagation; cyclotron resonance; Doppler shift; whistlers; geomagnetism
Subjects: VLF and LF waves in the magnetosphere; Magnetospheric electromagnetic wave propagation; Ionospheric electromagnetic wave propagation; Radiowave propagation
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