Characterization and mitigation of interference between GNSS radio occultation and reflectometry signals for low‐altitude occultations

Navigation ◽  
2020 ◽  
Vol 67 (3) ◽  
pp. 537-546 ◽  
Author(s):  
Ian Collett ◽  
Y. T. Jade Morton ◽  
Yang Wang ◽  
Brian Breitsch
Keyword(s):  
Radio Occultation ◽  
Low Altitude

scholarly journals Sporadic E morphology based on COSMIC radio occultation data and its relationship with wind shear theory

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Jia Luo ◽  
Haifeng Liu ◽  
Xiaohua Xu
Keyword(s):  
Magnetic Field ◽  
Wind Shear ◽  
Radio Occultation ◽  
Field Model ◽  
Global Distribution ◽  
Cosmic Radio ◽  
Neutral Wind ◽  
Earth’S Magnetic Field ◽  
Low Altitude ◽  
Sporadic E

AbstractThe S4max data retrieved from the Constellation Observing System for the Meteorology, Ionosphere, and Climate (COSMIC) radio occultation (RO) measurements during 2007 to 2015 is adopted to investigate the global distribution and seasonal variation of the sporadic E (Es) layers in the present work. The long-term and short-term global Es occurrence maps are presented and the spatial and temporal distributions of Es occurrence rates (ORs) are further confirmed and studied. The International Geomagnetic Reference Field model (IGRF12) is used to calculate the horizontal intensity and inclination of the Earth’s magnetic field. The analysis shows that the Earth’s magnetic field is one of the fundamental reasons for the global distribution of the Es layers. In addition, the Horizontal Wind Field model HWM14 and the IGRF12 model were employed to calculate the vertical ion convergence (VIC) to examine the role of neutral wind shear in the global distribution of the Es ORs. The results reveal that the middle latitude distribution of simulated vertical concentration of Fe+ is similar to that of Es ORs, which indicates that the VIC induced by the neutral wind shear is an important factor in determining the geographical distribution, summer maximum (or winter minimum) and diurnal characteristics of Es ORs in middle latitudes. The new findings mainly include the following two aspects: (1) in summer over mid-latitudes, VIC peaks in the morning and afternoon to evening, which explains the semidiurnal behavior of Es ORs; (2) VIC reaches its minimum value in low-altitude (100 km) areas, which is the reason for the significant decrease in Es ORs in low-altitude areas. The disagreements between the VIC and Es ORs indicate that other processes, such as the meteor influx rate, the ionospheric electric fields and atmospheric tides, should also be considered as they may have an important impact on the variation of Es layers. Graphical Abstract

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

The FengYun-3 Radio Occultation Sounder GNOS: A Review of the Missions and Early Results

2019 ◽  
Author(s):  
Yueqiang Sun ◽  
Congliang Liu ◽  
Weihua Bai ◽  
Yan Liu ◽  
Qifei Du ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Early Results
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