scholarly journals Magnetic aspect sensitivity of high-latitudeEregion irregularities measured by the RAX-2 CubeSat

2014 ◽  
Vol 119 (2) ◽  
pp. 1233-1249 ◽  
Author(s):  
H. Bahcivan ◽  
J. W. Cutler ◽  
J. C. Springmann ◽  
R. Doe ◽  
M. J. Nicolls
Keyword(s):  
Aspect Sensitivity

Observation and Study of the Aspect Sensitivity and Echo Mechanism Based on the Wuhan MST Radar

2019 ◽  
Vol 16 (2) ◽  
pp. 211-215
Author(s):  
Haiyin Qing ◽  
Zhengyu Zhao ◽  
Yaohui Xu ◽  
Chen Zhou
Keyword(s):  
Mst Radar ◽  
Aspect Sensitivity

ON THE GEOMETRY OF RADIO REFLECTIONS FROM AURORA

1960 ◽  
Vol 38 (5) ◽  
pp. 593-603 ◽  
Author(s):  
P. A. Forsyth
Keyword(s):  
Pulse Duration ◽  
Spatial Configuration ◽  
Beam Width ◽  
Volume Scattering ◽  
Antenna Beam ◽  
The Individual ◽  
Optical Evidence ◽  
Aspect Sensitivity

By assuming that auroral radio reflections are produced by volume scattering in clouds of ionization having the same spatial configuration as the visible auroral structures, and by taking into account the radar pulse duration and antenna beam width, it is possible to predict the probability of echo occurrence as a function of range and azimuth. This echo distribution is quite similar to that observed experimentally even when "aspect sensitivity" of the individual scatterer is neglected. Unfortunately, the optical evidence is not sufficiently extensive to permit precise calculations to be made, nor the radio evidence to permit detailed comparisons, but previous estimates of the shape of the scattering structures that have been based on the azimuthal echo distribution without regard to the factors discussed here are likely to be seriously in error.

Investigation on horizontal wind estimation around high aspect sensitivity

Radio Science ◽  
2001 ◽  
Vol 36 (6) ◽  
pp. 1477-1492 ◽  
Author(s):  
Noriyuki Kawano ◽  
Shoichiro Fukao
Keyword(s):  
Horizontal Wind ◽  
Wind Estimation ◽  
Aspect Sensitivity

scholarly journals Aspect sensitivity of VHF echoes from field aligned irregularities in meteor trails and thin ionization layers

2004 ◽  
Vol 4 (3) ◽  
pp. 685-692 ◽  
Author(s):  
Q. H. Zhou ◽  
Y. T. Morton ◽  
J. D. Mathews ◽  
D. Janches
Keyword(s):  
Diffusion Rate ◽  
Numerical Models ◽  
Mesopause Region ◽  
Incoherent Scatter ◽  
Vertical Extension ◽  
Spectral Peaks ◽  
Range Spread ◽  
Meteor Trails ◽  
Field Aligned Irregularities ◽  
Aspect Sensitivity

Abstract. The aspect sensitivity of VHF echoes from field aligned irregularities (FAI) within meteor trails and thin ionization layers is studied using numerical models. Although the maximum power is obtained when a radar is pointed perpendicular to the field line (B), substantial power can be obtained off the B direction if the ionization trail/layer is thin. When the FAI length along B is 20 m, the power observed 6° off B is about 10 db below that perpendicular to the B direction. Meteoric FAI echoes can potentially be used to determine the diffusion rate in the mesopause region. Based on the aspect sensitivity analysis, we conclude that the range spread trail echoes far off B observed by powerful VHF radars are likely due to overdense meteors. Our simulation also shows that ionospheric FAI echoes can have an altitude smearing effect of about 4 km if the vertical extension of a FAI-layer is around 100 m, which has often been observed at Arecibo. The altitude smearing effect can account for the fact that the Es-layers observed by the Arecibo incoherent scatter radar are typically much narrower than FAI-layers and the occurrence of double spectral peaks around the Es-layer altitude in FAI echoes.

On the Aspect Sensitivity of Radio Aurora

1972 ◽  
Vol 50 (21) ◽  
pp. 2557-2564 ◽  
Author(s):  
D. R. McDiarmid
Keyword(s):  
Measurement Errors ◽  
Aspect Angle ◽  
Sensitivity Curves ◽  
Angle Interval ◽  
Aspect Sensitivity

Previous measurements of the aspect sensitivity of radio aurora at VHF have yielded two distinctly different values, namely, 10 dB/deg and 1 to 2 dB/deg. In this paper, a previously discussed event is re-analyzed in greater detail in an attempt to resolve this apparent anomaly. The results of this analysis, which takes account of the effects of a number of measurement errors and uncertainties, lead to the conclusion that the aspect sensitivity of the event could not have been greater than [Formula: see text] in the aspect angle interval of approximately 4.5° to 19.5°. The most likely value is between 1.3 and 1.5 dB/deg. It is suggested that the two observed aspect sensitivity curves correspond to different radio aurora producing mechanisms.

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