haarp-induced substorm ? image by a. lee snyder a.v. streltsov thayer school of engineering,...
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HAARP-Induced Substorm ?HAARP-Induced Substorm ?
image by A. Lee Snyder
A.V. Streltsov
Thayer School of Engineering, Dartmouth College
also:
J. Kan, University of Alaska
A.L. Snyder, NorhWest Assoc.
E.V. Mishin, Hanscom AFRL
Substorm
The goal of this project is to develop/investigate mechanism of triggering substorm with HAARP
modified by S. Maus from Kivelson and Russel [1995]
Interaction of one discrete auroral arc (or two FACs) with the ionosphere
Ionospheric Feedback Mechanism (IFM)
ΕP P
j n ||
, where( )
2 20 || ( )
jn n nt eh
IFM + E + cavity = Ionospheric Feedback Instability (IFI)
IFI growth rate is large whenP is small, E is large and k is large
0P A 0P A 2 mho 0.16 0.39 mho 2 mho 0.91 2.11 mho
Interactions of magnetic field-aligned currents with the ionosphere
Streltsov and Lotko [2008]
HAARP
Background Parameters
Simulations
[Streltsov et al., 2005]
PP0 0[( ) ] j + Ε
continuesheating
single-pulseheating
periodicheating
Ei Pulse (sec) Pulse (sec)
10
20 215
30 160 160
40 125 140
50 100 120
60 90 107
70 80 100
80 80 90
90 75 90
100 67 90
spot size20 km
spot size30 km
ni = 4 x 104 cm-3
nm = 10 cm-3
• electric field in the ionosphere• density in the ionosphere• size of the heating spot• …
Frequency of HAARP modulation
Frequency of the IFI depends on:
25 tables for different combinations of parameters were generated
The Experiment
It was conducted from 05:30 to 08:00 UT on 29 October and 1 November 2008. It was conducted from 05:30 to 08:00 UT on 29 October and 1 November 2008.
The E-region was heated with 4.2 MHz X-mode waves focused to a 20 km spot in The E-region was heated with 4.2 MHz X-mode waves focused to a 20 km spot in
the direction of the magnetic zenith and vertically.the direction of the magnetic zenith and vertically.
The Experiment
The frequency of the heater modulation was determined from The frequency of the heater modulation was determined from
simulations of the ionospheric feedback instability for the simulations of the ionospheric feedback instability for the
parameters observed during the experiment. parameters observed during the experiment.
Results of the experiment have been recorded with:Results of the experiment have been recorded with:
1.1. HAARP fluxgate magnetometerHAARP fluxgate magnetometer
2.2. UAF/GI magnetometer arrayUAF/GI magnetometer array
3.3. HAARP induction magnetometerHAARP induction magnetometer
4.4. HAARP all-sky imagerHAARP all-sky imager
5.5. PIPER photometersPIPER photometers
6.6. HAARP HF digisonde HAARP HF digisonde
7.7. Modular UHF Ionospheric Radar (MUIR)Modular UHF Ionospheric Radar (MUIR)
8.8. Poker Flat all-sky imagerPoker Flat all-sky imager
Observations at HAARP were made by:• Anatoly V. Streltsov (PI) Dartmouth College• A. Lee Snyder NorthWest• Todd Pedersen AFRL Hanscom• Mike McCarrick BAE Systems• Robert Newsom Stanford University• Christopher Fallen Arctic Region SuperComp Center• Elizabeth Kendall SRI International
HAARP HF digisonde (A. Lee Snyder)
HAARP (Gakona) Fluxgate Magnetometer
UAF/GI magnetometer array
HAARP Induction Magnetometer(Mike McCarrick)
HAARP all-sky imager and PIPER photometers(Todd Pedersen and Robert Newsom )
HAARP all-sky imager (Todd Pedersen)
Conclusions
1. The Experiment conducted on HAARP on 10/29/2008 was a
complete success. It demonstrates that electromagnetic dynamics of the coupled magnetosphere-It demonstrates that electromagnetic dynamics of the coupled magnetosphere-
ionosphere system can be changed by HAARP, when the ambient geomagnetic ionosphere system can be changed by HAARP, when the ambient geomagnetic
conditions are favorable for the development of the ionospheric feedback conditions are favorable for the development of the ionospheric feedback
instability.instability.
2. The Experiment also demonstrate that this is just the beginning.
The new numerical model should be developed. This model should
include:• Time varying background parameters
• 3D geometry of the heated MI region
The model will be used to develop a new, more efficient scheme of the ionosphericThe model will be used to develop a new, more efficient scheme of the ionosphericheating with HAARP.heating with HAARP.
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