Excitation of oscillating two stream instability by upper hybrid pump waves in ionospheric heating experiments at Tromso

Spencer Kuo, M. C. Lee, Paul Kossey

Research output: Contribution to journalArticle

Abstract

It is shown that upper hybrid waves generated by the HF heater wave in the Tromso' heating experiments can excite oscillating two stream instability near the upper hybrid resonance layer of the heater wave. The sidebands of the investigated parametric instability are obliquely propagating Langmuir waves. These Langmuir waves can be excited in milliseconds and have a broad angular distribution. Thus, those waves propagating obliquely at small angles with respect to the geomagnetic field can contribute to the zero off-set frequency component of the plasma line spectrum detected by a backscatter radar. The analyses also show that the wavelengths of the Langmuir waves have an upper bound and consequently, explain why the zero off-set frequency plasma line has been detected by the EISCAT 933 MHz (UHF) radar, but not by the EISCAT 244 MHz (VHP) radar as reported in Stubbe et. al. [1992].

Original languageEnglish (US)
Pages (from-to)2969-2972
Number of pages4
JournalGeophysical Research Letters
Volume24
Issue number23
StatePublished - 1997

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ionospheric heating
pump
pumps
heating
excitation
experiment
radar
heaters
plasma spectra
plasma
plasma frequencies
geomagnetism
sidebands
geomagnetic field
backscatter
line spectra
angular distribution
wavelength

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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Excitation of oscillating two stream instability by upper hybrid pump waves in ionospheric heating experiments at Tromso. / Kuo, Spencer; Lee, M. C.; Kossey, Paul.

In: Geophysical Research Letters, Vol. 24, No. 23, 1997, p. 2969-2972.

Research output: Contribution to journalArticle

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AB - It is shown that upper hybrid waves generated by the HF heater wave in the Tromso' heating experiments can excite oscillating two stream instability near the upper hybrid resonance layer of the heater wave. The sidebands of the investigated parametric instability are obliquely propagating Langmuir waves. These Langmuir waves can be excited in milliseconds and have a broad angular distribution. Thus, those waves propagating obliquely at small angles with respect to the geomagnetic field can contribute to the zero off-set frequency component of the plasma line spectrum detected by a backscatter radar. The analyses also show that the wavelengths of the Langmuir waves have an upper bound and consequently, explain why the zero off-set frequency plasma line has been detected by the EISCAT 933 MHz (UHF) radar, but not by the EISCAT 244 MHz (VHP) radar as reported in Stubbe et. al. [1992].

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