Multi‐hop whistler‐mode ELF/VLF signals and triggered emissions excited by the HAARP HF heater

@article{Inan2004MultihopWE,
  title={Multi‐hop whistler‐mode ELF/VLF signals and triggered emissions excited by the HAARP HF heater},
  author={U. S. Inan and M. Gołkowski and Donald L. Carpenter and N. Reddell and Robert C. Moore and Timothy F. Bell and Evans W. Paschal and Paul A. Kossey and E. J. Kennedy and S. Meth},
  journal={Geophysical Research Letters},
  year={2004},
  volume={31}
}
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 (∼30 km) HAARP show 2‐hop signals which travel to the northern hemisphere upon reflection from the ionosphere in the south. Multiple reflected… 
View on Wiley
agupubs.onlinelibrary.wiley.com
48 Citations
Highly Influential Citations
2
Background Citations
11
Methods Citations
5
Results Citations
1

48 Citations

Cross modulation of whistler mode and HF waves above the HAARP ionospheric heater
The HF facility of the High Frequency Active Auroral Research Program (HAARP) is employed to generate ELF/VLF radiation by modulation of overhead auroral electrojet currents for magnetospheric wave…
Modulation Analysis of Whistler Mode Sidebands in VLF‐Triggered Emissions and Implications for Conditions of Nonlinear Growth
Experimental observations of very low frequency (VLF) triggered emissions are an important resource in investigation of nonlinear wave‐particle interactions between whistler mode waves and energetic…
Magnetospheric amplification and emission triggering by ELF/VLF waves injected by the 3.6 MW HAARP ionospheric heater
[1] The HF dipole array of the High Frequency Active Auroral Research Program (HAARP) in Gakona, Alaska, was recently upgraded to 180 elements, facilitating operations at a total radiated power level…
DEMETER observations of ELF waves injected with the HAARP HF transmitter
Modulated HF heating of the auroral electrojet is used to inject ELF signals into the magnetosphere that are observed on the low altitude DEMETER spacecraft. The HF heater is a component of the…
Orientation of the HAARP ELF ionospheric dipole and the auroral electrojet
The HF heating facility of the High Frequency Active Auroral Research Program (HAARP), located near Gakona, Alaska, generates ELF (300 Hz ‐ 3 kHz) waves via modulated HF (2.7–10 MHz) heating of the…
Magnetospheric effects from man‐made ELF/VLF modulation of the auroral electrojet
A model for the magnetospheric effects of ELF/VLF modulation of the auroral electrojet using high‐power ground‐based high‐frequency radio waves is developed. The effects of ducted topside whistler…
Magnetospheric injection of ELF/VLF waves with modulated or steered HF heating of the lower ionosphere
[1] ELF/VLF waves have been generated via steerable HF heating of the lower ionosphere. The temperature‐dependent conductivity of the lower ionospheric plasma enables HF heating (and subsequent…
Whistler waves produced by monochromatic currents in the low nighttime ionosphere
Abstract. We use a full-wave approach to find the field of monochromatic whistler waves, which are excited and propagating in the low nighttime ionosphere. The source current is located in the…
ELF/VLF phased array generation via frequency-matched steering of a continuous HF ionospheric heating beam
The radio spectrum between 300 Hz and 10 kHz (ELF/VLF) has broad applications to global communication, remote sensing of the ionosphere and magnetosphere, and subterranean prospecting. While…
Magnetospheric wave injection by modulated HF heating of the auroral electrojet
Modulated High Frequency (HF, 3—30 MHz) heating of the auroral electrojet to generate electromagnetic waves in the Extremely Low Frequency (ELF, 3—3000 Hz) and Very Low Frequency (VLF, 3—30 kHz)…
...
...

References

SHOWING 1-10 OF 39 REFERENCES
Cluster observations of ELF/VLF signals generated by modulated heating of the lower ionosphere with the HAARP HF transmitter
Abstract. It is now well known that amplitude modulated HF transmissions into the ionosphere can be used to generate ELF/VLF signals using the so-called "electrojet antenna". Although most…
ELF and VLF wave generation by modulated HF heating of the current carrying lower ionosphere
Interhemispheric propagation of VLF transmissions in the presence of ionospheric HF heating
Recent experiments carried out at the Arecibo Observatory in Puerto Rico and the magnetically conjugate location in Argentina suggest a connection between the prevalence and intensity of the…
On the frequency dependence of ELF/VLF waves produced by modulated ionospheric heating
We present results of the local field strength and, for the first time, apparent source height as a function of frequency from 200 to 6600 Hz of ELF/VLF waves produced in the auroral D region through…
ELF emission generated by the HAARP HF-heater using varying frequency and polarization
We present first observations of the ELF emission generated by the modulated ionospheric HF-heating using the HAARP facility. We focus primarily on the dependence of the polarization and of the…
VLF wave stimulation experiments in the magnetosphere from Siple Station, Antarctica
The Earth's magnetosphere is host to remarkable very low frequency (VLF) electromagnetic signals of natural origin. One of these, called a whistler, originates in lightning. Others, such as hiss and…
Comparison of ELF/VLF generation modes in the ionosphere by the HIPAS heater array
The characteristics of three different modes of ELF and VLF excitation using the high-power auroral simulation (HIPAS) HF heater array are compared under different ionospheric conditions. For each of…
Simultaneous triggered VLF emissions and energetic electron distributions observed on POLAR with PWI and HYDRA
We report simultaneous observations of energetic 1–20 keV electrons and VLF emissions triggered within the plasmasphere by pulses from ground based VLF transmitters, using the PWI and HYDRA…
Variable frequency VLF signals in the magnetosphere: Associated phenomena and plasma diagnostics
Coherent variable frequency signals (ramps) extending from 1 to 8 kHz, injected into the magnetosphere from Siple Station, Antarctica (L=4.3) exhibit upper and lower cutoffs when received at the…
VLF/ELF Radiation from the Ionospheric Dynamo Current System Modulated by Powerful HF Signals
...
...