The possibility of using all-sky meteor radar to observe ionospheric E-region field-aligned irregularities

2019 ◽  
Vol 62 (8) ◽  
pp. 1431-1437 ◽  
Author(s):  
HaiYong Xie ◽  
GuoZhu Li ◽  
BaiQi Ning ◽  
Iain Reid ◽  
LianHuan Hu ◽  
...  
Keyword(s):  
Meteor Radar ◽  
E Region ◽  
Field Aligned Irregularities

A discussion on D and E region winds over Europe - A study of the wind régime at an altitude of about 100 km by the meteor-radar method

1972 ◽  
Vol 271 (1217) ◽  
pp. 601-611 ◽  
Keyword(s):  
Meteor Radar ◽  
Wind Regime ◽  
Radar Method ◽  
E Region

Wind results obtained by the meteor-radar method at Heiss Island, Obninsk and Molodezhnaya during 1964-8 are described in terms of periodic and prevailing components.

scholarly journals E-Region Field-Aligned Irregularities in the Middle of a Solar Eclipse Observed by a Bistatic Radar

2022 ◽  
Vol 14 (2) ◽  
pp. 392
Author(s):  
Lei Qiao ◽  
Gang Chen ◽  
Wanlin Gong ◽  
Xuesi Cai ◽  
Erxiao Liu ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
Recovery Phase ◽  
Bistatic Radar ◽  
Doppler Shifts ◽  
Propagation Parameters ◽  
E Region ◽  
Gradient Drift ◽  
Drift Instability ◽  
Wave Induced ◽  
Field Aligned Irregularities

The Wuhan Ionospheric Oblique Backscatter Sounding System (WIOBSS) was applied as a bistatic radar to record the ionospheric E-region responses to a solar eclipse on 22 July 2009. The transmitter was located in Wuhan and the receiver was located in Huaian. The receiver observed anomalous echoes with larger Doppler shifts at the farther ranges compared with the echoes reflected by Es. According to the simulated ray propagation paths of the reflected and scattered waves, we considered that the anomalous echoes were scattered by E-region field-aligned irregularities (FAIs). The locations of the FAIs recorded by the WIOBSS were estimated with the International Geomagnetic Reference Field (IGRF) and the observed propagation parameters. These irregularities occurred at around the eclipse maximum and lasted for ~20–40 min. The steep plasma density gradient induced by the fast drop photo ionization under the lunar shadow was beneficial to the occurrence of gradient drift instability to generate the FAIs. They were different from the gravity wave-induced irregularities occurring in the recovery phase of the solar eclipse.

scholarly journals Simultaneous VHF radar backscatter and ionosonde observations of low-latitude E region

2005 ◽  
Vol 23 (3) ◽  
pp. 773-779 ◽  
Author(s):  
A. K. Patra ◽  
S. Sripathi ◽  
P. B. Rao ◽  
K. S. V. Subbarao
Keyword(s):  
Low Latitude ◽  
Vhf Radar ◽  
Radar Echoes ◽  
First Results ◽  
E Region ◽  
Gradient Drift ◽  
Drift Instability ◽  
Relationship Of ◽  
The Relationship ◽  
Field Aligned Irregularities

Abstract. The first results of simultaneous observations made on the low-latitude field-aligned irregularities (FAI) using the MST radar located at Gadanki (13.5° N, 79.2° E, dip 12.5°) and the Es parameters using an ionosonde at a nearby station Sriharikota (13.7° N, 80.1° E, dip 12.6°) are presented. The observations show that while the height of the most intense radar echoes is below the virtual height of Es (h'Es) during daytime, it is found to be either below or above during nighttime. The strength of the FAI is better correlated with the top penetration frequency (ftEs) and the blanketing frequency (fbEs) during the night (r=0.4 in both cases) as compared to the day (r=0.35 and -0.04, respectively). Furthermore, the signal strength of FAI is reasonably correlated with (ftEs-fbEs) during daytime (r=0.59) while very poorly correlated during nighttime (r=0.18). While the radar observations in general appear to have characteristics close to that of mid-latitudes, the relationship of these with the Es parameters are poorer than that of mid-latitudes. The observations reported here, nevertheless, are quite consistent with the expectations based on the gradient drift instability mechanism.

scholarly journals Seasonal variation of low-latitude E-region plasma irregularities studied using Gadanki radar and ionosonde

2008 ◽  
Vol 26 (7) ◽  
pp. 1865-1876 ◽  
Author(s):  
D. V. Phanikumar ◽  
A. K. Patra ◽  
C. V. Devasia ◽  
G. Yellaiah
Keyword(s):  
Seasonal Variation ◽  
Seasonal Variations ◽  
Low Latitude ◽  
Plasma Irregularities ◽  
Daytime Activity ◽  
Significant Difference ◽  
E Region ◽  
Region Plasma ◽  
Present Understanding ◽  
Field Aligned Irregularities

Abstract. In this paper, we present seasonal variation of E region field-aligned irregularities (FAIs) observed using the Gadanki radar and compare them with the seasonal variation of Es observed from a nearby location SHAR. During daytime, FAIs occur maximum in summer and throughout the day, as compared to other seasons. During nighttime, FAIs occur equally in both summer and winter, and relatively less in equinoxes. Seasonal variations of Es (i.e. ftEs and fbEs) show that the daytime activity is maximum in summer and the nighttime activity is maximum in equinoxes. No relation is found between FAIs occurrence/SNR and ftEs/fbEs. FAIs occurrence, however, is found to be related well with (ftEs−fbEs). This aspect is discussed in the light of the present understanding of the mid-latitude Es-FAIs relationship. The seasonal variations of FAIs observed at Gadanki are compared in detail with those of Piura, which show a significant difference in the daytime observations. The observed difference has been discussed considering the factors governing the generation of FAIs.

scholarly journals Daytime E region field‐aligned irregularities observed during a solar eclipse

2014 ◽  
Vol 119 (12) ◽  
Author(s):  
Gang Chen ◽  
Chen Wu ◽  
Zhengyu Zhao ◽  
Dingkun Zhong ◽  
Hao Qi ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
E Region ◽  
Field Aligned Irregularities

scholarly journals LowerEregion field-aligned irregularities studied using the Equatorial Atmosphere Radar and meteor radar in Indonesia

2007 ◽  
Vol 112 (A1) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. K. Patra ◽  
T. Yokoyama ◽  
M. Yamamoto ◽  
T. Nakamura ◽  
T. Tsuda ◽  
...  
Keyword(s):  
Meteor Radar ◽  
Field Aligned Irregularities

scholarly journals The ultra-fast Kelvin waves in the equatorial ionosphere: observations and modeling

2013 ◽  
Vol 31 (2) ◽  
pp. 209-215 ◽  
Author(s):  
A. N. Onohara ◽  
I. S. Batista ◽  
H. Takahashi
Keyword(s):  
Lower Thermosphere ◽  
Equatorial Ionosphere ◽  
Equatorial Region ◽  
South American ◽  
Meteor Radar ◽  
Vertical Coupling ◽  
Wave Characteristics ◽  
E Region ◽  
Mesosphere And Lower Thermosphere ◽  
Mlt Region

Abstract. The main purpose of this study is to investigate the vertical coupling between the mesosphere and lower thermosphere (MLT) region and the ionosphere through ultra-fast Kelvin (UFK) waves in the equatorial atmosphere. The effect of UFK waves on the ionospheric parameters was estimated using an ionospheric model which calculates electrostatic potential in the E-region and solves coupled electrodynamics of the equatorial ionosphere in the E- and F-regions. The UFK wave was observed in the South American equatorial region during February–March 2005. The MLT wind data obtained by meteor radar at São João do Cariri (7.5° S, 37.5° W) and ionospheric F-layer bottom height (h'F) observed by ionosonde at Fortaleza (3.9° S; 38.4° W) were used in order to calculate the wave characteristics and amplitude of oscillation. The simulation results showed that the combined electrodynamical effect of tides and UFK waves in the MLT region could explain the oscillations observed in the ionospheric parameters.

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