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Stimulation of Pc 1 geomagnetic pulsations by naturally occurring repetitive VLF activity
Author(s) -
FraserSmith A. C.,
Helliwell R. A.
Publication year - 1980
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl007i010p00851
Subject(s) - earth's magnetic field , magnetosphere , geophysics , whistler , very low frequency , physics , ionosphere , noise (video) , lightning (connector) , substorm , magnetic field , astronomy , quantum mechanics , power (physics) , artificial intelligence , computer science , image (mathematics)
Several different mechanisms have been suggested for the natural stimulation of Pc 1 geomagnetic pulsation events. These mechanisms include hydromagnetic noise in the magnetosphere, bursts of radiation from high‐energy charged particles, or sferics from lightning discharges. Guided by the results of experiments to generate Pc 1 pulsations by VLF transmissions into the magnetosphere, and by the theory that has been developed in support of these experiments, we now propose a new mechanism: the stimulation of Pc 1 pulsation events by naturally occurring repetitive VLF signals. The VLF signals may be echoing whistlers, periodic chorus elements, or other periodic or quasiperiodic VLF wavetrains echoing along a geomagnetic field line. Preliminary support for this hypothesis is provided by a comparison of the Pc 1 pulsations and VLF activity occurring at Roberval, Quebec, during 9 intervals of simultaneous Pc 1 pulsation and VLF measurement.