scholarly journals Formation of plasma around a small meteoroid: 2. Implications for radar head echo

2017 ◽  
Vol 122 (4) ◽  
pp. 4697-4711 ◽  
Author(s):  
Y. S. Dimant ◽  
M. M. Oppenheim
Keyword(s):  
Head Echo

scholarly journals Meteor head echo polarization at 930 MHz studied with the EISCAT UHF HPLA radar

2011 ◽  
Vol 29 (6) ◽  
pp. 1197-1208 ◽  
Author(s):  
G. Wannberg ◽  
A. Westman ◽  
A. Pellinen-Wannberg
Keyword(s):  
Angle Of Incidence ◽  
Resonance Effects ◽  
Observation Volume ◽  
Polarization Characteristics ◽  
Radar Measurements ◽  
Head Echo ◽  
Using Data ◽  
Static Head ◽  
First Time ◽  
Underdense Plasma

Abstract. The polarization characteristics of 930-MHz meteor head echoes have been studied for the first time, using data obtained in a series of radar measurements carried out with the tristatic EISCAT UHF high power, large aperture (HPLA) radar system in October 2009. An analysis of 44 tri-static head echo events shows that the polarization of the echo signal recorded by the Kiruna receiver often fluctuates strongly on time scales of tens of microseconds, illustrating that the scattering process is essentially stochastic. On longer timescales (> milliseconds), more than 90 % of the recorded events show an average polarization signature that is independent of meteor direction of arrival and echo strength and equal to that of an incoherent-scatter return from underdense plasma filling the tristatic observation volume. This shows that the head echo plasma targets scatter isotropically, which in turn implies that they are much smaller than the 33-cm wavelength and close to spherically symmetric, in very good agreement with results from a previous EISCAT UHF study of the head echo RCS/meteor angle-of-incidence relationship. Significant polarization is present in only three events with unique target trajectories. These all show a larger effective target cross section transverse to the trajectory than parallel to it. We propose that the observed polarization may be a signature of a transverse charge separation plasma resonance in the region immediately behind the meteor head, similar to the resonance effects previously discussed in connection with meteor trail echoes by Herlofson, Billam and Browne, Jones and Jones and others.

scholarly journals Amplitude domain analysis of strong range and Doppler spread radar echos

2008 ◽  
Vol 26 (8) ◽  
pp. 2419-2426 ◽  
Author(s):  
J. Vierinen ◽  
M. S. Lehtinen ◽  
I. I. Virtanen
Keyword(s):  
Domain Analysis ◽  
Doppler Spread ◽  
Estimation Methods ◽  
Radar Target ◽  
Analysis Method ◽  
Novel Method ◽  
Head Echo

Abstract. We present a novel method for analyzing range and Doppler spread targets in the amplitude domain using linear statistical inversion. The result of the analysis is an estimate of the range dependent amplitude behaviour of the target backscatter during the time that the transmission passes the target. A meteor head echo and strong backscatter from artificially heated regions of the ionosphere are used to demonstrate this novel analysis method. Plans to apply amplitude-domain radar target estimation methods to more complicated noisy underdetermined targets are also briefly discussed.

scholarly journals MU radar head echo observations of the 2011 October Draconids

2012 ◽  
Vol 424 (3) ◽  
pp. 1799-1806 ◽  
Author(s):  
J. Kero ◽  
Y. Fujiwara ◽  
M. Abo ◽  
C. Szasz ◽  
T. Nakamura
Keyword(s):  
Mu Radar ◽  
Head Echo

scholarly journals 18. A note on the head echo problem

1968 ◽  
Vol 33 ◽  
pp. 187-189 ◽  
Author(s):  
J. Rajchl
Keyword(s):  
Cross Sections ◽  
Dissociative Recombination ◽  
Molecular Flow ◽  
Recombination Coefficient ◽  
Interaction Layer ◽  
Atmospheric Molecules ◽  
A Value ◽  
The Mean ◽  
Head Echo ◽  
Absolute Magnitudes

A model of the head echo is examined, in which, as a source of ionization and recombination, an interaction layer of impinging atmospheric molecules (O2) mixing with reflected ones is assumed. Dissociative recombination is considered as the most probable process. If we suppose that the interaction layer is that arising in nearly free molecular flow with no shock wave present, we obtain, using the observed heights of head echoes, dimensions of meteoroids in the range 10–1 cm for absolute magnitudes between −10 and −2. It is shown that such a layer may be used to explain the high initial recombination coefficient of the order of 10−5 cm3/sec. Using the ionization collision cross-sections measured by Utterback (1963) we obtain for the mean extent of the interaction layer a value 1–100 m for heights 80–130 km, in accordance with radar observations.

scholarly journals On the meteoric head echo radar cross section angular dependence

2008 ◽  
Vol 35 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. Kero ◽  
C. Szasz ◽  
G. Wannberg ◽  
A. Pellinen-Wannberg ◽  
A. Westman
Keyword(s):  
Angular Dependence ◽  
Cross Section ◽  
Radar Cross Section ◽  
Head Echo ◽  
Echo Radar

Improving the Accuracy of Meteoroid Mass Estimates from Head Echo Deceleration

2007 ◽  
Vol 102 (1-4) ◽  
pp. 379-382 ◽  
Author(s):  
Elizabeth Bass ◽  
Meers Oppenheim ◽  
Jorge Chau ◽  
Alice Olmstead
Keyword(s):  
Head Echo

scholarly journals The 2009-2010 MU radar head echo observation programme for sporadic and shower meteors: radiant densities and diurnal rates

2012 ◽  
Vol 425 (1) ◽  
pp. 135-146 ◽  
Author(s):  
J. Kero ◽  
C. Szasz ◽  
T. Nakamura ◽  
D. D. Meisel ◽  
M. Ueda ◽  
...  
Keyword(s):  
Mu Radar ◽  
Head Echo ◽  
Observation Programme

scholarly journals RADAR DETECTABILITY STUDIES OF SLOW AND SMALL ZODIACAL DUST CLOUD PARTICLES. I. THE CASE OF ARECIBO 430 MHz METEOR HEAD ECHO OBSERVATIONS

2014 ◽  
Vol 796 (1) ◽  
pp. 41 ◽  
Author(s):  
D. Janches ◽  
J. M. C. Plane ◽  
D. Nesvorný ◽  
W. Feng ◽  
D. Vokrouhlický ◽  
...  
Keyword(s):  
Dust Cloud ◽  
Zodiacal Dust ◽  
Head Echo ◽  
Cloud Particles

Meteor head echo radar data: Mass–velocity selection effects

Icarus ◽  
2007 ◽  
Vol 186 (2) ◽  
pp. 547-556 ◽  
Author(s):  
S. Close ◽  
P. Brown ◽  
M. Campbell-Brown ◽  
M. Oppenheim ◽  
P. Colestock
Keyword(s):  
Mass Velocity ◽  
Radar Data ◽  
Selection Effects ◽  
Head Echo ◽  
Echo Radar ◽  
Velocity Selection
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