Generation of the Super Small-Scale Artificial Ionospheric Irregularities in the Ionosphere Pumped by High-Power HF Radio Waves

Abstract. A new method of determining the anisotropy parameters of small-scale irregularities in the ionospheric F region is presented and experimental results are shown. The method is based on observations of amplitude fluctuations of radio waves transmitted by satellites flying above the F region. In practice, Russian navigational satellites are used and both the amplitude and the phase of the received signal is measured on the ground level. The method determines both the field-aligned anisotropy and the field-perpendicular anisotropy and orientation of the spatial spectrum of the irregularities, assuming that the contours of constant power have an elliptic shape. A possibility of applying the method to amplitude tomography is also discussed. Using a chain of receivers on the ground level, one could locate the regions of small-scale irregularities as well as determine their relative intensities. Then the large-scale background structures could be mapped simultaneously by means of ordinary ray tomography using the phase observations, and therefore the relations of small-scale and large-scale structures could be investigated.Key words. Ionosphere (auroral ionosphere; ionospheric irregularities; instruments and techniques)

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Generation of Artificial Ionospheric Irregularities in the Midlatitude Ionosphere Modified by High-Power High-Frequency X-Mode Radio Waves

Radiophysics and Quantum Electronics ◽

10.1007/s11141-014-9523-8 ◽

2014 ◽

Vol 57 (6) ◽

pp. 393-416 ◽

Cited By ~ 8

Author(s):

V. L. Frolov ◽

I. A. Bolotin ◽

G. P. Komrakov ◽

A. V. Pershin ◽

G. G. Vertogradov ◽

...

Keyword(s):

High Power ◽

High Frequency ◽

Ionospheric Irregularities ◽

Radio Waves ◽

Midlatitude Ionosphere

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Non-Linear Interaction of MHD Waves with Small-Scale Ionospheric Irregularities

Telecommunications and Radio Engineering ◽

10.1615/telecomradeng.v61.i12.60 ◽

2004 ◽

Vol 61 (7-12) ◽

pp. 1055-1071

Author(s):

N. N. Gerasimova ◽

V. G. Sinitsin ◽

Yu. M. Yampolski

Keyword(s):

Ionospheric Irregularities ◽

Mhd Waves ◽

Small Scale ◽

Linear Interaction ◽

Non Linear

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Changing ionization of the lower ionosphere due to high-power radio waves

Radiophysics and Quantum Electronics ◽

10.1007/bf01037721 ◽

1977 ◽

Vol 20 (12) ◽

pp. 1230-1239 ◽

Cited By ~ 6

Author(s):

A. V. Gurevich ◽

G. M. Milikh ◽

I. S. Shlyuger

Keyword(s):

High Power ◽

Lower Ionosphere ◽

Radio Waves

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Recent Advances in Active Ionospheric Modulation by High-Power HF Radio-Waves and Sideband Detections

2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC) ◽

10.23919/ursi-at-rasc.2018.8471442 ◽

2018 ◽

Author(s):

Alireza Mahmoudian ◽

Brett Isham ◽

Paul Bcrnhardt ◽

Eliana Nossa ◽

Stan Briczinski

Keyword(s):

High Power ◽

Radio Waves ◽

Recent Advances

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Peculiarities of Excitation of Large-Scale Plasma Density Irregularities During Modification of the Ionospheric F 2 Region by High-Power HF Radio Waves

Radiophysics and Quantum Electronics ◽

10.1007/s11141-016-9644-3 ◽

2016 ◽

Vol 58 (10) ◽

pp. 717-728 ◽

Cited By ~ 4

Author(s):

V. L. Frolov ◽

E. A. Schorokhova ◽

V. E. Kunitsyn ◽

E. S. Andreeva ◽

A. M. Padokhin

Keyword(s):

Plasma Density ◽

High Power ◽

Large Scale ◽

Radio Waves

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High Power CPU Cooling Experiment

ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium ◽

10.1115/cie1995-0838 ◽

1995 ◽

Author(s):

Elizabeth B. Nadworny ◽

T. Gary Yip ◽

Nader Farag

Keyword(s):

Heat Transfer ◽

High Power ◽

Power Dissipation ◽

Heat Removal ◽

Data Acquisition System ◽

Heat Sinks ◽

Small Scale ◽

Heat Transfer Area ◽

Pin Fin ◽

Transfer Parameters

Abstract This experimental study focuses on the enhancement of the heat removal process by modifying the geometry of pin fin heat sinks, while maintaining the same effective heat transfer area. The pins are cut at an angle to reduce the blockage of air flow across the surface. To perform this study, a small scale wind tunnel facility has been designed specifically for testing high power dissipation processors and other ULSI components. The facility is fully automated and controlled by an HP3852A Data Acquisition System interfaced with a 486 based PC computer. The average surface temperature, Reynolds number, Nusselt number and other relevant heat transfer parameters were reduced from the data collected. Results from the study show that a heat sink with an angled trailing edge produces the greatest enhancement of heat removal. The mechanism for the improved heat transfer is the larger temperature gradient across the surface, which is obtained by lowering the minimum temperature on the surface.

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