scholarly journals A case study of mesospheric gravity wave momentum flux and dynamical instability using the Arecibo dual beam incoherent scatter radar

2006 ◽  
Vol 33 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Qihou Zhou ◽  
Y. T. Morton
Keyword(s):  
Gravity Wave ◽  
Momentum Flux ◽  
Dynamical Instability ◽  
Incoherent Scatter Radar ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Dual Beam ◽  
Wave Momentum

Influence of an inertia-gravity wave on mesospheric dynamics: A case study with the Poker Flat Incoherent Scatter Radar

2010 ◽  
Vol 115 ◽  
Author(s):  
M. J. Nicolls ◽  
R. H. Varney ◽  
S. L. Vadas ◽  
P. A. Stamus ◽  
C. J. Heinselman ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Incoherent Scatter Radar ◽  
Incoherent Scatter ◽  
Scatter Radar

scholarly journals The EISCAT Svalbard radar: A case study in modern incoherent scatter radar system design

Radio Science ◽  
1997 ◽  
Vol 32 (6) ◽  
pp. 2283-2307 ◽  
Author(s):  
G. Wannberg ◽  
I. Wolf ◽  
L.-G. Vanhainen ◽  
K. Koskenniemi ◽  
J. Röttger ◽  
...  
Keyword(s):  
System Design ◽  
Radar System ◽  
Incoherent Scatter Radar ◽  
Incoherent Scatter ◽  
Scatter Radar

scholarly journals Common volume coherent and incoherent scatter radar observations of mid-latitude sporadic E-layers and QP echoes

2004 ◽  
Vol 22 (9) ◽  
pp. 3277-3290 ◽  
Author(s):  
D. L. Hysell ◽  
M. F. Larsen ◽  
Q. H. Zhou
Keyword(s):  
Large Scale ◽  
Incoherent Scatter Radar ◽  
Coherent Scatter ◽  
Electrostatic Waves ◽  
Incoherent Scatter ◽  
Scatter Radar ◽  
Dual Beam ◽  
Sporadic E Layers ◽  
E Region ◽  
Sporadic E

Abstract. Common-volume observations of sporadic E-layers made on 14-15 June 2002 with the Arecibo incoherent scatter radar and a 30MHz coherent scatter radar imager located on St. Croix are described. Operating in dual-beam mode, the Arecibo radar detected a slowly descending sporadic E-layer accompanied by a series of dense E-region plasma clouds at a time when the coherent scatter radar was detecting quasi-periodic (QP) echoes. Using coherent radar imaging, we collocate the sources of the coherent scatter with the plasma clouds observed by Arecibo. In addition to patchy, polarized scattering regions drifting through the radar illuminated volume, which have been observed in previous imaging experiments, the 30MHz radar also detected large-scale electrostatic waves in the E-region over Puerto Rico, with a wavelength of about 30km and a period of about 10min, propagating to the southwest. Both the intensity and the Doppler shifts of the coherent echoes were modulated by the wave.

scholarly journals Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar

2012 ◽  
Vol 30 (6) ◽  
pp. 945-962 ◽  
Author(s):  
M. J. Nicolls ◽  
D. C. Fritts ◽  
D. Janches ◽  
C. J. Heinselman
Keyword(s):  
Momentum Flux ◽  
Vertical Flux ◽  
Robust Estimator ◽  
Incoherent Scatter Radar ◽  
Frequency Wave ◽  
Incoherent Scatter ◽  
Error Covariance ◽  
Scatter Radar ◽  
Velocity Variances ◽  
Zonal Momentum

Abstract. In this paper, we develop an estimator for the vertical flux of horizontal momentum with arbitrary beam pointing, applicable to the case of arbitrary but fixed beam pointing with systems such as the Poker Flat Incoherent Scatter Radar (PFISR). This method uses information from all available beams to resolve the variances of the wind field in addition to the vertical flux of both meridional and zonal momentum, targeted for high-frequency wave motions. The estimator utilises the full covariance of the distributed measurements, which provides a significant reduction in errors over the direct extension of previously developed techniques and allows for the calculation of an error covariance matrix of the estimated quantities. We find that for the PFISR experiment, we can construct an unbiased and robust estimator of the momentum flux if sufficient and proper beam orientations are chosen, which can in the future be optimized for the expected frequency distribution of momentum-containing scales. However, there is a potential trade-off between biases and standard errors introduced with the new approach, which must be taken into account when assessing the momentum fluxes. We apply the estimator to PFISR measurements on 23 April 2008 and 21 December 2007, from 60–85 km altitude, and show expected results as compared to mean winds and in relation to the measured vertical velocity variances.

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