Multi-hop Whistler-Mode ELF/VLF Signals and Triggered Emissions Excited by the HAARP HF Heater

Abstract

Modulated heating of the lower ionosphere with the HAARP HF heater is used to excite 1-2 kHz signals observed on a ship-borne receiver in the geomagnetic conjugate hemisphere after propagating as ducted whistler-mode signals. These 1-hop signals are believed to be amplified, and are accompanied by triggered emissions. Simultaneous observations near (tilde 30 km) HAARP show 2-hop signals which travel to the northern hemisphere upon reflection from the ionosphere in the south. Multiple reflected signals, up to 10-hop, are detected, with the signal dispersing and evolving in shape, indicative of re-amplification and re-triggering of emissions during successive traversals of the equatorial interaction regions.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 28, 2004
Accession Number
ADA515081

Entities

People

  • D. L. Carpenter
  • E. Kennedy
  • E. Paschal
  • Mark GoĊ‚kowski
  • N. Reddell
  • P. Kossey
  • R. C. Moore
  • S. Z. Meth
  • T. F. Bell
  • U. S. Inan

Organizations

  • Stanford University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Altitude
  • Carrier Frequencies
  • Cyclotron Resonance
  • Detection
  • Electron Density
  • Electron Energy
  • Electrons
  • Emission
  • Frequency
  • High Altitude
  • Military Research
  • Modulation
  • Radiation
  • United States
  • Whistlers

Fields of Study

  • Environmental science

Readers

  • Radio communications and signal processing.
  • Space/Atmospheric Physics.