scholarly journals Local determination of ionospheric plasma convection from coherent scatter radar data using the SECS technique

2010 ◽  
Vol 115 (A3) ◽  
pp. n/a-n/a ◽  
Author(s):  
O. Amm ◽  
A. Grocott ◽  
M. Lester ◽  
T. K. Yeoman
Keyword(s):  
Ionospheric Plasma ◽  
Radar Data ◽  
Plasma Convection ◽  
Coherent Scatter ◽  
Scatter Radar ◽  
Local Determination

scholarly journals Statistical observations of the MLT, latitude and size of pulsed ionospheric flows with the CUTLASS Finland radar

1999 ◽  
Vol 17 (7) ◽  
pp. 855-867 ◽  
Author(s):  
G. Provan ◽  
T. K. Yeoman
Keyword(s):  
Hf Radar ◽  
High Time Resolution ◽  
Plasma Convection ◽  
Unified Framework ◽  
Coherent Scatter ◽  
Radar Observations ◽  
Scatter Radar ◽  
Precipitation Regimes ◽  
Low Altitude ◽  
Flux Transfer

Abstract. A study has been performed on the occurrence of pulsed ionospheric flows as detected by the CUTLASS Finland HF radar. These flows have been suggested as being created at the ionospheric footprint of newly-reconnected field lines, during episodes of magnetic flux transfer into the terrestrial magnetosphere (flux transfer events or FTEs). Two years of both high-time resolution and normal scan data from the CUTLASS Finland radar have been analysed in order to perform a statistical study of the extent and location of the pulsed ionospheric flows. We note a great similarity between the statistical pattern of the coherent radar observations of pulsed ionospheric flows and the traditional low-altitude satellite identification of the particle signature associated with the cusp/cleft region. However, the coherent scatter radar observations suggest that the merging gap is far wider than that proposed by the Newell and Meng model. The new model for cusp low-altitude particle signatures, proposed by Lockwood and Onsager and Lockwood provides a unified framework to explain the dayside precipitation regimes observed both by the low-altitude satellites and by coherent scatter radar detection.Key words. Magnetospheric physics (magnetosphere · ionosphere interactions; plasma convection; solar wind-magnetosphere interactions)

scholarly journals Analysis of Sentinel 1 Radar Data to Identify Frozing/Thawing Soils in the Area of Anadyr (Chukotka) and Belaya Gora (Yakutia)

2019 ◽  
pp. 29-37
Author(s):  
N. V. Rodionova
Keyword(s):  
Soil Layer ◽  
Texture Features ◽  
Threshold Value ◽  
Radar Data ◽  
Backscatter Coefficient ◽  
Frozen Soils ◽  
Multi Temporal ◽  
Db Difference ◽  
Archive Data

The paper deals with the distinction between thawed and frozen soils in the upper 5 cm layer for two stations in Russia: Belaya Gora (Yakutia) 68.5° N and Anadyr (Chukotka) 64.78° N — by using Sentinel 1 C-band radar data for the period of 2014–2016 years. Determination of the frozen/thawed soil state is carried out in three ways: 1) by multi-temporal radar data on the basis of a significant in 3–5 dB difference in the backscatter coefficient σ0 in the transition of freezing/thawing soil state, 2) by finding the threshold value of σ0 at which the temperature in the upper soil layer falls below 00С, 3) by texture features for one- channel images. The graphs of the AFI (air freezing index) for the period of 2012-2018 with trends are constructed based on the archive data of air temperature for the study areas.

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