The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Kami mengkaji proses gandingan tiga gelombang yang berlaku dalam eksperimen penghantaran kuasa gelombang mikro (MPT) dalam plasma ionosfera dengan menjalankan eksperimen komputer dengan model PIC (Particle-In-Cell) elektromagnet satu dimensi. Untuk mengkaji variasi spatial proses gandingan, kami terus memancarkan gelombang elektromagnet yang kuat daripada antena yang terletak di sempadan simulasi. Dalam gandingan tiga gelombang, gelombang elektrostatik frekuensi rendah teruja sebagai akibat daripada interaksi tak linear antara gelombang pam perambatan hadapan dan gelombang penyerakan belakang. Dalam eksperimen komputer, letupan elektrostatik frekuensi rendah diperhatikan secara tidak berterusan di angkasa. Ketakselanjaran letusan elektrostatik dikira oleh pemanasan elektron tempatan disebabkan oleh letusan dan pengubahsuaian yang berkaitan dengan hubungan penyebaran gelombang. Dalam kes di mana gelombang pam merambat sepanjang medan geomagnet Bext, beberapa letusan gelombang Langmuir diperhatikan. Oleh kerana letusan pertama menggunakan sebahagian daripada tenaga gelombang pam, gelombang pam menjadi lemah dan tidak boleh mencetuskan gandingan tiga gelombang di luar kawasan tempat letusan berlaku. Oleh kerana hubungan serakan gelombang Langmuir berubah-ubah disebabkan oleh pemanasan elektron tempatan oleh letusan, keadaan gandingan akhirnya menjadi tidak berpuas hati dan interaksi pertama menjadi lemah. Satu lagi letusan gelombang Langmuir diperhatikan di kawasan yang berbeza di luar lokasi letusan pertama. Dalam kes perambatan serenjang, gelombang hibrid atas, salah satu cabang mod gelombang harmonik siklotron elektron, teruja. Oleh kerana hubungan penyebaran gelombang hibrid atas kurang sensitif terhadap suhu elektron, keadaan gandingan tidak mudah dilanggar oleh peningkatan suhu. Akibatnya, gandingan tiga gelombang secara berkala berlaku dalam masa dan akhirnya nisbah penghantaran gelombang mikro menjadi kira-kira 20% manakala hampir tiada pengecilan gelombang pam diperhatikan selepas pecah elektrostatik pertama dalam kes selari.
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Salinan
Hideyuki USUI, Hiroshi MATSUMOTO, Roger GENDRIN, Takeo NISHIKAWA, "Computer Experiments on a Three-Wave Coupling in Association with Microwave Power Transmission in Space Plasma" in IEICE TRANSACTIONS on Communications,
vol. E84-B, no. 9, pp. 2566-2573, September 2001, doi: .
Abstract: We studied a three-wave coupling process occurring in microwave power transmission (MPT) experiment in the ionospheric plasma by performing computer experiments with one-dimensional electromagnetic PIC (Particle-In-Cell) model. In order to examine the spatial variation of the coupling process, we continuously emitted intense electromagnetic wave from an antenna located at a simulation boundary. In the three-wave coupling, a low-frequency electrostatic wave is excited as the consequence of a nonlinear interaction between the forward propagating pump wave and backscattered one. In the computer experiments, low-frequency electrostatic bursts are discontinuously observed in space. The discontinuity of the electrostatic bursts is accounted for by the local electron heating due to the bursts and associated modification of the wave dispersion relation. In a case where the pump wave propagates along the geomagnetic field Bext, several bursts of Langmuir waves are observed. Since the first burst consumes a part of the pump wave energy, the pump wave is weakened and cannot trigger the three-wave coupling beyond the region where the burst occurs. Since the dispersion relation of the Langmuir wave is variable due to the local electron heating by the burst, the coupling condition eventually becomes unsatisfied and the first interaction becomes weak. Another burst of Langmuir waves is observed at a different region beyond the location of the first burst. In the case of perpendicular propagation, the upper hybrid wave, one of the mode branches of the electron cyclotron harmonic waves, is excited. Since the dispersion relation of the upper hybrid wave is less sensitive to the electron temperature, the coupling condition is not easily violated by the temperature increase. As a result, the three-wave coupling periodically takes place in time and eventually the transmission ratio of the microwaves becomes approximately 20% while almost no attenuation of the pump waves is observed after the first electrostatic burst in the parallel case.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e84-b_9_2566/_p
Salinan
@ARTICLE{e84-b_9_2566,
author={Hideyuki USUI, Hiroshi MATSUMOTO, Roger GENDRIN, Takeo NISHIKAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={Computer Experiments on a Three-Wave Coupling in Association with Microwave Power Transmission in Space Plasma},
year={2001},
volume={E84-B},
number={9},
pages={2566-2573},
abstract={We studied a three-wave coupling process occurring in microwave power transmission (MPT) experiment in the ionospheric plasma by performing computer experiments with one-dimensional electromagnetic PIC (Particle-In-Cell) model. In order to examine the spatial variation of the coupling process, we continuously emitted intense electromagnetic wave from an antenna located at a simulation boundary. In the three-wave coupling, a low-frequency electrostatic wave is excited as the consequence of a nonlinear interaction between the forward propagating pump wave and backscattered one. In the computer experiments, low-frequency electrostatic bursts are discontinuously observed in space. The discontinuity of the electrostatic bursts is accounted for by the local electron heating due to the bursts and associated modification of the wave dispersion relation. In a case where the pump wave propagates along the geomagnetic field Bext, several bursts of Langmuir waves are observed. Since the first burst consumes a part of the pump wave energy, the pump wave is weakened and cannot trigger the three-wave coupling beyond the region where the burst occurs. Since the dispersion relation of the Langmuir wave is variable due to the local electron heating by the burst, the coupling condition eventually becomes unsatisfied and the first interaction becomes weak. Another burst of Langmuir waves is observed at a different region beyond the location of the first burst. In the case of perpendicular propagation, the upper hybrid wave, one of the mode branches of the electron cyclotron harmonic waves, is excited. Since the dispersion relation of the upper hybrid wave is less sensitive to the electron temperature, the coupling condition is not easily violated by the temperature increase. As a result, the three-wave coupling periodically takes place in time and eventually the transmission ratio of the microwaves becomes approximately 20% while almost no attenuation of the pump waves is observed after the first electrostatic burst in the parallel case.},
keywords={},
doi={},
ISSN={},
month={September},}
Salinan
TY - JOUR
TI - Computer Experiments on a Three-Wave Coupling in Association with Microwave Power Transmission in Space Plasma
T2 - IEICE TRANSACTIONS on Communications
SP - 2566
EP - 2573
AU - Hideyuki USUI
AU - Hiroshi MATSUMOTO
AU - Roger GENDRIN
AU - Takeo NISHIKAWA
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E84-B
IS - 9
JA - IEICE TRANSACTIONS on Communications
Y1 - September 2001
AB - We studied a three-wave coupling process occurring in microwave power transmission (MPT) experiment in the ionospheric plasma by performing computer experiments with one-dimensional electromagnetic PIC (Particle-In-Cell) model. In order to examine the spatial variation of the coupling process, we continuously emitted intense electromagnetic wave from an antenna located at a simulation boundary. In the three-wave coupling, a low-frequency electrostatic wave is excited as the consequence of a nonlinear interaction between the forward propagating pump wave and backscattered one. In the computer experiments, low-frequency electrostatic bursts are discontinuously observed in space. The discontinuity of the electrostatic bursts is accounted for by the local electron heating due to the bursts and associated modification of the wave dispersion relation. In a case where the pump wave propagates along the geomagnetic field Bext, several bursts of Langmuir waves are observed. Since the first burst consumes a part of the pump wave energy, the pump wave is weakened and cannot trigger the three-wave coupling beyond the region where the burst occurs. Since the dispersion relation of the Langmuir wave is variable due to the local electron heating by the burst, the coupling condition eventually becomes unsatisfied and the first interaction becomes weak. Another burst of Langmuir waves is observed at a different region beyond the location of the first burst. In the case of perpendicular propagation, the upper hybrid wave, one of the mode branches of the electron cyclotron harmonic waves, is excited. Since the dispersion relation of the upper hybrid wave is less sensitive to the electron temperature, the coupling condition is not easily violated by the temperature increase. As a result, the three-wave coupling periodically takes place in time and eventually the transmission ratio of the microwaves becomes approximately 20% while almost no attenuation of the pump waves is observed after the first electrostatic burst in the parallel case.
ER -