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Abbravation: Annales Geophysicae

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Copernicus GmbH

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10.1007/s12462-011-426-5

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0992-7689

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ELF wave generation in the ionosphere using pulse

Authors: Barr R Stubbe P Rietveld M T
Publish Date: 1999/06/30
Volume: 17, Issue: 6, Pages: 759-769
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Abstract

Abstract This paper describes the results of a preliminary study to determine the effective heating and cooling time constants of ionospheric currents in a simulated modulated HF heating `beam painting configuration It has been found that even and odd harmonics of the fundamental ELF wave used to amplitude modulate the HF heater are sourced from different regions of the ionosphere which support significantly different heating and cooling time constants The fundamental frequency and its odd harmonics are sourced in a region of the ionosphere where the heating and cooling time constants are about equal The even harmonics on the other hand are sourced from regions of the ionosphere characterised by ratios of cooling to heating time constant greater than ten It is thought that the even harmonics are sourced in the lower ionosphere around 65 km where the currents are much smaller than at the higher altitudes around 78 km where the currents at the fundamental frequency and odd harmonics maximise Key words Electromagnetics antennae · Ionosphere active experiments · Radio science non linear phenomena

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  2. The relationship between VHF radar auroral backscatter amplitude and Doppler velocity: a statistical study
  3. Long-period fading in atmospherics during severe meteorological activity and associated solar geophysical phenomena at low latitudes
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  9. Low frequency waves in plasmas with spatially varying electron temperature
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  11. MUREX: a land-surface field experiment to study the annual cycle of the energy and water budgets
  12. Observations of long-lived solar wind streams during 1990-1993
  13. On the prediction of solar activity using different neural network models
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  15. An overview of a heavy rain event in southeastern Iberia: the role of large-scale meteorological conditions
  16. Cooling rate of thermal electrons by electron impact excitation of fine structure levels of atomic oxygen
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