Generation of auroral kilometric and z-mode radiation by the cyclotron maser instability

Thesis/Dissertation · Sat Dec 31 23:00:00 EST 1983

OSTI ID:5940753

Omidi, N

Generation of auroral kilometric and Z-mode radiation by the cyclotron maser mechanism is studied. This study entails investigation of the relativistic Doppler shifted cyclotron resonance condition and the growth of electromagnetic waves by the cyclotron maser mechanism. It is shown that the cylcotron resonance condition defines an ellipse in velocity space when the product of the index of refraction and cosine of the wave normal angle is less than or equal to one and a partial ellipse when the above product is larger than one. It is also shown that waves with frequencies greater than the gyrofrequency (or its harmonic for higher harmonic resonances) can only resonate with particles moving in the same direction along the magnetic field, while waves with frequencies less than the gyrofrequency (or its harmonic), resonate with particles moving in both directions along the magnetic field. The relativistic resonance condition and the electron distribution function in velocity space obtained by the S3-3 satellite are used to numerically calculate growth rates for both the auroral kilometric and Z-mode radiation. The results show that this electron distribution is unstable and provides positive growth rates for both the aforementioned emissions.

• Research Organization: Iowa Univ., Iowa City (USA)
• OSTI ID: 5940753
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAE
CYCLOTRON INSTABILITY
CYCLOTRON RESONANCE
DISTRIBUTION FUNCTIONS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
INSTABILITY
LEPTONS
LONG WAVE RADIATION
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
RADIATIONS
RADIOWAVE RADIATION
RESONANCE