Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1476p&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1476
Physics
[2403] Ionosphere / Active Experiments, [2407] Ionosphere / Auroral Ionosphere, [2471] Ionosphere / Plasma Waves And Instabilities, [2487] Ionosphere / Wave Propagation
Scientific paper
The High Frequency Active Auroral Research Program (HAARP) transmitter array is currently one of the most advanced High Frequency (HF) transmitters used primary for ionospheric research. It can radiate with continuous power of 3.6 MW in the frequency range from 2.8 MHz to 10 MHz, forming a narrow HF beam in the vertical direction which can be used to change the conductivity of the auroral electrojet through ambient electron heating. One of the unique properties of the HF transmitter is its ability to modulate the amplitude of the HF beam with frequencies up to 30 kHz and also reposition the beam up to 30 degree from the vertical within 10 us. The modulated beam produces modulation in the electrojet currents, which then radiate plasma waves at the modulation frequency. All this flexibility makes the HAARP HF transmitter very useful for the study of different types of electromagnetic waves, and some of the most important are Extremely Low Frequency (ELF) waves of 300 - 3000 Hz generated via modulation of the auroral electrojet current. In this work we use DEMETER satellite observations of HAARP generated HF and ELF waves over the transmitter and ELF waves over the magnetically conjugate point to the transmitter. DEMETER is a low-earth orbit satellite (660 km) capable of simultaneous measurements of both electromagnetic ELF/HF waves and electron/ion densities and temperatures. There are two classes of experiments discussed in this work. First is a statistical study of many similar modulation patterns transmitted during very different natural conditions through the period of several years. This allows the study of the average radiation pattern in both the HF and ELF ranges. In the second class of experiments, the specific properties of HAARP excited plasma waves and their effects are studied case by case. These types of experiments include wave-particle interaction observations and a comparison of the efficiency of different modulation patterns such as different frequencies, forms or types of modulation (e.g. amplitude modulation versus geometric modulation).
Bell Timothy F.
Cohen Martin
Inan Umran S.
Parrot Michel
Piddyachiy D.
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