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.