Wave interaction observations of ionospheric modification in the D-region by C. J Chilton

Cover of: Wave interaction observations of ionospheric modification in the D-region | C. J Chilton

Published by U.S. Dept. of Commerce, National Telecommunications and Information Administration in [Boulder, Colo.?] .

Written in English

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Subjects:

  • Radio waves,
  • Electromagnetic interactions

Edition Notes

Book details

StatementC.J. Chilton
SeriesNTIA-report -- 81-66, NTIA report -- 81-66
ContributionsUnited States. National Telecommunications and Information Administration
The Physical Object
Paginationv, 34 p. :
Number of Pages34
ID Numbers
Open LibraryOL14990016M

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Wave interaction observations of ionospheric modification in the D-region. [Boulder, Colo.?]: U.S. Dept. of Commerce, National Telecommunications and Information Administration, []. WAVE INTERACTION OBSERVATIONS OF IONOSPHERIC MODIFICATION IN THE D-REGION Charles J.

Chilton* Radio wave interaction measurements using the high power transmitter at Platteville have resulted in cross modulation of up to 30% as compared to the earlier cross modulation measurements of 7% or less at low power.

Radio wave interaction measurements using the high power transmitter at Platteville resulted in cross modulation of up to 30 percent as compared to the earlier cross modulation measurements of 7 percent or less at low power.

A theory is derived which shows that for a high power heating transmitter, the cross modulation is proportional to the square of the electron : Charles J.

Chilton. Observations of Ionospheric ELF and VLF Wave Generation by Excitation of the Thermal Cubic Nonlinearity Article (PDF Available) in Physical Review Letters (23).

The first applies only to the strong modifying HF wave (if in 0-mode), but not to 19 Julyf0 = MHz, to + 3s Review of ionospheric modification experiments at Tromso UT ERP = MW to + 2s to + Is - Time 0 dB dB dB dB dB to However, at times when the ionospheric variability (as measured by the fading rate Cited by:   1.

Introduction [2] The ionospheric D region is the lower ionosphere, in altitudes D region electron. An ionospheric HF‐modification experiment was carried out near Tromsø, Norway, using the Max‐Planck‐Institut für Aeronomie (MPI) heating facility and the EISCAT ‐MHz incoherent scatter radar (ISR).

The MPI heater was normally operated at MHz and modulated 20‐s on, 40‐s off. Isham, T. Hagfors, Observations of the temporal and spatial development of induced and natural plasma lines during HF modification experiments at Arecibo using chirped incoherent scatter radar, Journal of Geophysical Research: Space Physics, /93JA, 98, A8, (), ().

Finally, we have shown how ionospheric modification might be able to take advantage of the lens‐like properties of multiple FAI to enhance VLF wave power in artificial duct experiments. However, in order for this to be practicable, we must be able to not only create artificial FAI but also to have good control of their properties.

We examine ionospheric 6–day oscillation during the September SSW event using GAIA simulations. The 6–day oscillation is generated not by the 6–day wave but by 10–14 hour waves.

The nonlinear interaction between the 6–day wave and tides leads to a. It is obvious that 8. Interaction of Atmospheric Waves with the Ionosphere the real atmosphere Wave interaction observations of ionospheric modification in the D-region book much more complicated than the highly idealized cases discussed here.

The reader should consult specialized books for a detailed discussion [see, for example, Ratcliffe (1 )]. Our interest here is to study the wave propagation in the atmosphere. Lauren W. Blum, Aaron W.

Breneman, in The Dynamic Loss of Earth's Radiation Belts, Summary. In this review, we discussed the role of wave-particle interactions in driving loss of radiation belt electrons, with an emphasis on observational signatures of this process. These include direct measurements of precipitation, wave properties, and variations in the trapped electron.

Recent ionospheric modification experiments performed at Tromsø, Norway, have indicated that X-mode pump wave is capable of stimulating high-frequency enhanced plasma lines, which manifests the.

We report some interesting ionospheric characteristics associated with wave–particle interactions with observations of the ionosonde and co-located incoherent scatter radar (ISR) at Millstone Hill in a storm-enhanced density (SED) plume identified from two-dimensional GPS TEC maps during a super geomagnetic storm on Nov.

20, We have adapted Fejer's well-known cross-modulation probing method to determine the extent of ionospheric conductivity modification in the D region ionosphere with high (5 μsec) time resolution.

From earlier works of anomalous absorption observations also at Tromsø (Jones et al., ; Robinson, ), a series of ionospheric modification experiments showed that O-mode heating at MHz and an ERP of MW caused a considerable diagnostic amplitude reduction at frequencies of,and MHz (∼ MHz higher.

Beat wave generation experiment for study of VLF whistler wave interactions with ionospheric plasmas and radiation belts Conference Paper in IEEE International Conference on Plasma Science July.

'Many observations in the ionospheric heating experiment, by a powerful high frequency electromagnetic wave with ordinary polarization launched from a ground-based facility, is attributed to.

Experimental observations performed during dual beam ionospheric HF heating experiments at the High frequency Active Auroral Research Program (HAARP) HF transmitter in Gakona, Alaska are used to quantify the relative importance of specific nonlinear interactions that occur within the D region ionosphere.

During these experiments, HAARP broadcast two amplitude modulated HF beams whose. This paper highlights the best results obtained during D-region modification experiments performed by the University of Florida at the High-frequency Active Auroral Research Program (HAARP) observatory between and Over this period, we have seen a tremendous improvement in ELF/VLF wave generation efficiency.

We have identified methods to characterize ambient and modified ionospheric. Full text of "HAARP High Power Experiments And Observations Of Ionospheric Interactions" See other formats HAARP HIGH POWER EXPERIMENTS AND OBSERVATIONS OF IONOSPHERIC INTERACTIONS Paul Rodriguez ' 1 ', Edward Kennedy' 2 ', Paul Kossey' 3 ', Michael Kaiser' 4 ', Jean-Louis Bougeret' 5 ', William Kurth' 6 ', William Bristow' 7 ' (l) Information Technology Division Naval.

This book is aimed at professional scientists, engineers and students who need an intermediate-level reference and/or text. Students of aeronomy and radio wave propagation are introduced to basic wave theory in absorbing, anisotropic and dispersive media and to the physics of production, loss, and movement of plasma in the ionosphere presence of the geomagnetic field.

The purpose of the HF ionospheric modification experiments was to investigate the behavior of artificially produced E region irregularities at auroral latitudes. The majority of observations were made with backscatter radars operating at and MHz, but limited observations were also made at and MHz.

We have examined large numbers of Los Alamos Sferic Array (LASA) recordings of D-region reflections of lightning long-wave ( kHz) emissions at various local times [Jacobson et al., ; Jacobson et al., ; Jacobson et al., a; Jacobson et al., b].

Here we analyze local-nighttime reflection observations, and attempt to correlate with measures of the overall thunderstorm. This paper highlights the best results obtained during D-region modification experiments performed by the University of Florida at the High-frequency Active Auroral Research Program (HAARP) observatory between and Over this period, we saw a tremendous improvement in ELF/VLF wave generation efficiency.

We identified methods to characterize ambient and modified ionospheric. The coherent and resonant wave interaction is considered to take place in a weakly magnetized and collisionless Vlasov plasma.

The instability growth rate is computed for parameter values typical of ionospheric modification experiments, in which a powerful high frequency electromagnetic pump wave is injected into the ionospheric F-region from.

The experiment was boosted from Poker Flat Research Range, located at ([degrees]N, [degrees]W) at UT. The experiment studied beam-plasma interactions between two to six keV electron beams and the ionospheric plasma.

Observations were made of plasma waves between the plasma frequency and the upper hybrid frequency. The ionosphere (/ aɪ ˈ ɒ n ə ˌ s f ɪər /) is the ionized part of Earth's upper atmosphere, from about 60 km (37 mi) to 1, km ( mi) altitude, a region that includes the thermosphere and parts of the mesosphere and ionosphere is ionized by solar radiation.

It plays an important role in atmospheric electricity and forms the inner edge of the magnetosphere. @article{osti_, title = {Generation of cyclotron harmonic waves in the ionospheric modification experiments}, author = {Janabi, A H.A. and Kumar, A and Sharma, R P and Tripathi, Y K}, abstractNote = {In the present paper, the parametric decay instability of the pump X-mode into electron Bernstein wave (EBW) near second harmonics of electron cyclotron frequency and IBW at different.

Abstract. The first published observation of the phenomenon of modification of the terrestrial ionosphere by high power radio waves was made by Butt (), who observed that the transmission from Radio Paris was superimposed on the signal transmitted by Radio Luxembourg.

Although the majority of ionospheric irregularities produced by HF heating occur in the E- and F-regions of the ionosphere, our primary interest lies in the highly collisional D-region ionosphere, located between 60 and km D-region is responsible for the vast majority of signal absorption that trans-ionospherically propagating radio waves experience, and the absorption process.

Reciprocity Diversity References Chapter 6 Ionospheric Disturbances Types of Disturbance Sudden Ionospheric Disturbances Z)- Region Absorption Sudden Phase Anomalies Sudden Frequency Deviations Effects on Very High Frequencies Ionospheric Storms @article{osti_, title = {Historical overview of HF ionospheric modification research}, author = {Gordon, W E and Duncan, L M}, abstractNote = {Radio waves have inadvertently modified the Earth's ionosphere since the Luxembourg observations of Tellegen in and perhaps since Marconi in The history of ionospheric modification by radio waves is reviewed, beginning with Marconi.

SuperDARN observations of ionospheric heater-induced upper hybrid waves. VLF effects of D-region modification, 16th RF Ionospheric Interactions Workshop, Santa Fe, NM, AprilJ. T.-H. Electromagnetic wave interaction with the auroral plasma, Ph.D. thesis.

University of California, Los Angeles. pages. Sudden Ionospheric Disturbances resulting from an interaction of the Solar Flare radiation with the constituents of the upper atmosphere constitute one of the three major aspects of ground level monitoring of solar flares -the other two being optical observations of flares, and the observations of solar bursts in radio wavelengths.

Stimulated emissions excited by ionospheric modification facilities areAnomalous radio wave absorption due to ionospheric heating effects, Radio Sci, ADS CrossRef Google Scholar. Utlaut, W.

F., and Violette, E. J.,A summary of vertical incidence radio observations of ionospheric modification, Radio Sci, 9: Ionosphere & Radiowave Propagation The ionosphere is the key area for HF propagation - take a look at this page to find out what it is; how it becomes ionised; why does it support HF radio communications & how why does it support radiowave propagation.

HAARP High Power Experiments And Observations Of Ionospheric Interactions by Rodriguez, Paul; Kennedy, Edward; Kossey, Paul; Kaiser, Michael; Bougeret, Jean-Louis; Kurth, William; Bristow, William. "We review experiments in ionospheric modification. In the years since the pioneering efforts of Sir Edward Appleton, M.

Barnett, G. Breit, and M. Thve, many radio techniques have been employed to investigate the terrestrial ionosphere. The purposes of this book are to exam ine the basic physical interaction process of radio waves with the ionosphere, scrutinize each of the radio techniques currently in use, and describe the elements.

Piddyachiy D., U. Inan, M. Parrot (), Observations of ELF/VLF signals generated by full power HAARP array aboard DEMETER satellite, RF Ionospheric Interactions Workshop, Santa Fe. The High-frequency Active Auroral Research Program (HAARP) was initiated as an ionospheric research program jointly funded by the U.S.

Air Force, the U.S. Navy, the University of Alaska Fairbanks, and the Defense Advanced Research Projects Agency (DARPA). It was designed and built by BAE Advanced original purpose was to analyze the ionosphere and investigate the .The interaction of radio waves with the terrestrial ionosphere has been described in considerable detail in several "classic" treatments, e.g., Ratcliffe (), Al'pert (), Budden () and Davies (), Rishbeth and e.g., Flock (), Davies Garriott (), and in other more recent books, (), Hargreaves (), and Budden ().For instance, without considering nonlinearities, a high-power HF radio wave might be attenuated by 20 dB as it traverses the D-region ionosphere.

Thermal nonlinearities (produced by the radio wave heating the plasma) could produce an additional 5 dB of attenuation. Still other nonlinearities have yet to .

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