Stimulation of ULF (ultra-low-frequencies) geomagnetic pulsations by controlled VLF (very-low-frequencies) transmissions into the magnetosphere. Technical report January 1975-February 1977

Technical Report · Thu Dec 01 04:00:00 EST 1977

OSTI ID:5458351

Fraser-Smith, A C; Helliwell, R A; Bell, T F; Crystal, T L; Dingle, B

This report presents the results of an investigation of a proposed method for the controlled artificial generation of ultra-low-frequency (ULF) hydromagnetic waves of class Pc 1 (0.2 to 5 Hz) in the ionosphere and magnetosphere. In this method, which is called the VLF method, a large ground-based very-low-frequency (VLF) transmitter is used to stimulate the ULF waves by injecting pulses of VLF waves into the magnetosphere. A second possible method of ULF wave generation, the peninsula method, is discussed in a companion report. Combining the theoretical and experimental results obtained during this research, it is suggested that naturally-occurring repetitive VLF activity can stimulate Pc 1 pulsation events, and it is further suggested that such VLF activity may be a major source of stimulation for Pc 1 pulsations. Thus, future experiments on ULF wave generation with ground-based VLF transmitters would probably benefit greatly if they were combined with a program of simultaneous observations of naturally-occurring VLF and ULF activity.

• Research Organization: Stanford Univ., CA (USA). Stanford Electronics Labs.
• OSTI ID: 5458351
• Report Number(s): AD-A-131773/4
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY-LEVEL TRANSITIONS
HYDROMAGNETIC WAVES
MAGNETOSPHERE
RADIATIONS
STIMULATED EMISSION
ULTRALOW FREQUENCY RADIATION
WAVE PROPAGATION