Plasma Modification Associated with Parametric Instabilities Driven by Intense Electromagnetic Waves. (Part 1). Parametric Instabilities and Ionospheric Modification. (Part 2)

1973 ◽  
Author(s):  
Hans W. Hendel ◽  
C. R. Oberman ◽  
F. W. Perkins ◽  
E. J. Valeo
Keyword(s):  
Electromagnetic Waves ◽  
Plasma Modification ◽  
Ionospheric Modification ◽  
Parametric Instabilities

scholarly journals Effects of multiple scatter on the propagation and absorption of electromagnetic waves in a field-aligned-striated cold magneto-plasma: implications for ionospheric modification experiments

2002 ◽  
Vol 20 (1) ◽  
pp. 41-55 ◽  
Author(s):  
T. R. Robinson
Keyword(s):  
Electric Fields ◽  
Plasma Density ◽  
Electromagnetic Waves ◽  
Broad Band ◽  
Radio Science ◽  
Multiple Scatter ◽  
Electromagnetic Test ◽  
Ionospheric Modification ◽  
Hybrid Resonance ◽  
Single Scatter

Abstract. A new theory of the propagation of low power electromagnetic test waves through the upper-hybrid resonance layer in the presence of magnetic field-aligned plasma density striations, which includes the effects of multiple scatter, is presented. The case of sinusoidal striations in a cold magnetoplasma is treated rigorously and then extended, in an approximate manner, to the broad-band striation spectrum and warm plasma cases. In contrast to previous, single scatter theories, it is found that the interaction layer is much broader than the wavelength of the test wave. This is due to the combined electric fields of the scattered waves becoming localised on the contour of a fixed plasma density, which corresponds to a constant value for the local upper-hybrid resonance frequency over the whole interaction region. The results are applied to the calculation of the refractive index of an ordinary mode test wave during modification experiments in the ionospheric F-region. Although strong anomalous absorption arises, no new cutoffs occur at the upper-hybrid resonance, so that in contrast to the predictions of previous single scatter theories, no additional reflections occur there. These results are consistent with observations made during ionospheric modification experiments at Tromsø, Norway.Key words. Ionosphere (active experiments; ionospheric irregularities) Radio science (ionospheric propagation)

Parametric Instabilities in Strongly Relativistic, Plane-Polarized Electromagnetic Waves

1976 ◽  
Vol 36 (1) ◽  
pp. 31-34 ◽  
Author(s):  
J. F. Drake ◽  
Y. C. Lee ◽  
N. L. Tsintsadze
Keyword(s):  
Electromagnetic Waves ◽  
Parametric Instabilities

Parametric instabilities of both space charge and electromagnetic waves in GaAs semiconductors

2000 ◽  
Author(s):  
M. Tecpoyotl-Torres ◽  
B. Salazar-Hernandez ◽  
S. V. Koshevaya ◽  
Gennadiy Burlak ◽  
J. Escobedo-Alatorre ◽  
...  
Keyword(s):  
Space Charge ◽  
Electromagnetic Waves ◽  
Parametric Instabilities

Parametric instabilities and ionospheric modification

1974 ◽  
Vol 79 (10) ◽  
pp. 1478-1496 ◽  
Author(s):  
F. W. Perkins ◽  
C. Oberman ◽  
E. J. Valeo
Keyword(s):  
Ionospheric Modification ◽  
Parametric Instabilities

Seti Space Missions

1997 ◽  
Vol 161 ◽  
pp. 761-776 ◽  
Author(s):  
Claudio Maccone
Keyword(s):  
Electromagnetic Waves ◽  
Space Missions ◽  
Gravitational Lens ◽  
The Sun ◽  
Space Antenna ◽  
Focal Distance ◽  
Large Space ◽  
The Earth ◽  
Space Antennas ◽  
New Space

AbstractSETI from space is currently envisaged in three ways: i) by large space antennas orbiting the Earth that could be used for both VLBI and SETI (VSOP and RadioAstron missions), ii) by a radiotelescope inside the Saha far side Moon crater and an Earth-link antenna on the Mare Smythii near side plain. Such SETIMOON mission would require no astronaut work since a Tether, deployed in Moon orbit until the two antennas landed softly, would also be the cable connecting them. Alternatively, a data relay satellite orbiting the Earth-Moon Lagrangian pointL2would avoid the Earthlink antenna, iii) by a large space antenna put at the foci of the Sun gravitational lens: 1) for electromagnetic waves, the minimal focal distance is 550 Astronomical Units (AU) or 14 times beyond Pluto. One could use the huge radio magnifications of sources aligned to the Sun and spacecraft; 2) for gravitational waves and neutrinos, the focus lies between 22.45 and 29.59 AU (Uranus and Neptune orbits), with a flight time of less than 30 years. Two new space missions, of SETI interest if ET’s use neutrinos for communications, are proposed.

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