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Kam, H.,Jee, G.,Kim, Y.,Ham, Y.b.,Song, I.S. Elsevier Science Ltd ; Pergamon 2017 Journal of Atmospheric and Solar-Terrestrial Physi Vol.155 No.-
We have investigated the characteristics of mesospheric short period (<1h) gravity waves which were observed with all-sky images of OH Meinel band and OI 557nm airglows over King Sejong Station (KSS) (62.22<SUP>o</SUP>S, 58.78<SUP>o</SUP>W) during a period of 2008-2015. By applying 2-dimensional FFT to time differenced images, we derived horizontal wavelengths, phase speeds, and propagating directions (188 and 173 quasi-monochromatic waves from OH and OI airglow images, respectively). The majority of the observed waves propagated predominantly westward, implying that eastward waves were filtered out by strong eastward stratospheric winds. In order to obtain the intrinsic properties of the observed waves, we utilized winds simultaneously measured by KSS Meteor Radar and temperatures from Aura Microwave Limb Sounder (MLS). More than half the waves propagated horizontally, as waves were in Doppler duct or evanescent in the vertical direction. This might be due to strong eastward background wind field in the mesosphere over KSS. For freely propagating waves, the vertical wavelengths were in the interquartile range of 9-33km with a median value of 15km. The vertical wavelengths are shorter than those observed at Halley station (76<SUP>o</SUP>S, 27<SUP>o</SUP>W) where the majority of the observed waves were freely propagating. The difference in the wave propagating characteristics between KSS and Halley station suggests that gravity waves may affect mesospheric dynamics in this part of the Antarctic Peninsula more strongly than over the Antarctic continent. Furthermore, strong wind shear over KSS played an important role in changing the vertical wavenumbers as the waves propagated upward between two airglow layers (87 and 96km).
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Wafaa Abd El-Basit,Safaa Mohamed El-Ghanam,Ashraf Mosleh Abdel-Maksood,Sanaa Abd El-Tawab Kamh,Fouad Abd El-Moniem Saad Soliman 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.5
The present paper reports on a trial to shed further light on the characterization, applications, and operation of radar speed guns or Gunn diodes on different radiation environments of neutron or g fields. To this end, theoretical and experimental investigations of microwave oscillating system for outer-space applications were carried out. Radiation effects on the transient parameters and electrical properties of the proposed devices have been studied in detail with the application of computer programming. Also, the oscillation parameters, power characteristics, and bias current were plotted under the influence of different g and neutron irradiation levels. Finally, shelf or oven annealing processes were shown to be satisfactory techniques to recover the initial characteristics of the irradiated devices.
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