Altitudinal and latitudinal variations in ionospheric Sporadic‐E layer obtained from FORMOSAT‐3/COSMIC radio occultation

2021 ◽  
Author(s):  
Lihui Qiu ◽  
Tao Yu ◽  
Xiangxiang Yan ◽  
Yangyi Sun ◽  
Xiaomin Zuo ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Cosmic Radio ◽  
Sporadic E Layer ◽  
Latitudinal Variations ◽  
Sporadic E

An attempt to inverse the ionospheric sporadic-E layer critical frequency based on the COSMIC radio occultation data

2019 ◽  
Vol 63 (3) ◽  
pp. 1204-1213 ◽  
Author(s):  
Jun Niu ◽  
Li-bin Weng ◽  
Han-xian Fang
Keyword(s):  
Critical Frequency ◽  
Radio Occultation ◽  
Cosmic Radio ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Occultation Data ◽  
Radio Occultation Data

Global Sporadic E Layer Characteristics Obtained from GPS Radio Occultation Measurements

2013 ◽  
pp. 207-221 ◽  
Author(s):  
Christina Arras ◽  
Jens Wickert ◽  
Christoph Jacobi ◽  
Georg Beyerle ◽  
Stefan Heise ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes

2009 ◽  
Vol 27 (6) ◽  
pp. 2555-2563 ◽  
Author(s):  
C. Arras ◽  
C. Jacobi ◽  
J. Wickert
Keyword(s):  
Global Positioning System ◽  
Zonal Wind ◽  
Radio Occultation ◽  
Positioning System ◽  
Semidiurnal Tide ◽  
Meteor Radar ◽  
Global Positioning ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Wind Shears

Abstract. GPS (Global Positioning System) Radio occultation (RO) measurements from CHAMP, GRACE and FORMOSAT-3/COSMIC satellites at Northern Hemisphere midlatitides (50°–55° N) are analysed to obtain the diurnal variation of sporadic E layer occurrence frequency in 2006 and 2007. Interconnections with zonal wind shears measured by meteor radar at Collm (51.3° N, 13° E), Germany, are investigated. According to theory, maximum Es occurrence is expected when the zonal wind shear, which is mainly produced by the semidiurnal tide in midlatitudes, is negative. This is confirmed by the present measurements and analysis.

scholarly journals Modulation of sporadic E layers by small-scale atmospheric waves in Earth’s high-latitude ionosphere

2019 ◽  
Vol 5 (3) ◽  
pp. 116-129
Author(s):  
Владимир Губенко ◽  
Vladimir Gubenko ◽  
Иван Кириллович ◽  
Ivan Kirillovich
Keyword(s):  
High Latitude ◽  
Radio Occultation ◽  
Small Scale ◽  
Polar Cap ◽  
Atmospheric Waves ◽  
Sporadic E Layers ◽  
High Latitude Ionosphere ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Good Agreement

We have used radio occultation measurements of the satellite CHAMP (Challenging Minisatellite Payload) to examine sporadic E layers (altitudes 90–130 km) in Earth’s high-latitude ionosphere. We have developed a new method for determining characteristics of internal atmospheric waves based on the use of inclined sporadic E layers of Earth’s ionosphere as a detector. The method relies on the fact that an internal wave propagating through the initially horizontal sporadic E layer causes the plasma density gradient to rotate in the direction of the wave vector, which leads to the fact that the layer ionization plane is set parallel to the phase wave front. The developed method enables us to study the interrelations between small-scale internal waves and sporadic E layers in Earth’s ionosphere and significantly expands the capabilities of traditional radio occultation monitoring of the atmosphere. We have found that the internal atmospheric waves under study have periods from 35 to 46 min and vertical phase speeds from 1.2 to 2.0 m/s, which are in good agreement with the results of independent experiments and simulation data on sporadic E layers at a height of ~100 km in Earth’s polar cap.

scholarly journals Global morphology of ionospheric sporadic E layer from the FormoSat-3/COSMIC GPS radio occultation experiment

GPS Solutions ◽  
2018 ◽  
Vol 22 (4) ◽  
Author(s):  
Lung-Chih Tsai ◽  
Shin-Yi Su ◽  
Chao-Han Liu ◽  
Harald Schuh ◽  
Jens Wickert ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals Sounding of sporadic E layers from CSES radio occultation and comparing with ionosonde measurements

2022 ◽  
Author(s):  
Chengkun Gan ◽  
Jiayu Hu ◽  
Xiaomin Luo ◽  
Chao Xiong ◽  
Shengfeng Gu
Keyword(s):  
Standard Deviation ◽  
Radio Occultation ◽  
Density Ratio ◽  
Mean Value ◽  
Middle Latitudes ◽  
Sporadic E Layers ◽  
Sporadic E Layer ◽  
The Difference ◽  
Sporadic E ◽  
New Criterion

Abstract. GNSS radio occultation (RO) plays an important role in ionospheric electron density inversion and sounding of sporadic E layers. As the China's first electromagnetic satellite, China Seismo Electromagnetic Satellite (CSES) has collected the RO data from both GPS and BDS-2 satellites since March 2018. In this study, we extracted the carrier to noise density ratio (CNR) data of CSES and calculated the standard deviation of normalized CNR. A new criterion is developed to determine the Es events, that is when the mean value of the absolute value of the difference between the normalized CNR is greater than 3 times of the standard deviation. The statistics show that sporadic E layers have strong seasonal variations with highest occurrence rates in summer season at middle latitudes. It is also found that the occurrence height of Es is mainly located at 90–110 km, and the period of local time 15:00–18:00 is the high incidence period of Es. In addition, the geometric altitudes of a sporadic E layer detected in CSES radio occultation profiles and the virtual heights of a sporadic E layer obtained by the Wuhan Zuo Ling Tai (ZLT) ionosonde show four different space-time matching criterions. Our results reveal that there is a good agreement between both parameters which is reflected in the significant correlation.

Derivation of metallic plasma layers in Earth's ionosphere (Sporadic E layer) from FORMOSAT-3/COSMIC satellites at a global scale

2020 ◽  
Author(s):  
Bingkun Yu ◽  
Christopher Scott ◽  
Xianghui Xue ◽  
Xinan Yue ◽  
Xiankang Dou
Keyword(s):  
Radio Occultation ◽  
Satellite System ◽  
Global Scale ◽  
Scintillation Index ◽  
Navigation Satellite ◽  
The Past ◽  
Successful Launch ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Global Navigation Satellite

<p>In the past decades, the scintillations of Global Navigation Satellite System (GNSS) radio occultation (RO) measurements have been widely employed to study the occurrence of sporadic E (Es) layers. Recent results indicated that amplitude scintillation index (S4max) observations can be used to study the intensity of global Es layers. In this study, we show a statistical assessment of the hourly ionospheric Es layer measurements between 90 and 130 km from FORMOSAT-3/COSMIC satellites. The Es observations from FORMOSAT-3/COSMIC satellites are in agreement with those from ground-based ionosonde stations at different latitudes. With the successful launch of FORMOSAT-7/COSMIC-2, an accurate, high-resolution (< 5° ×5°×1 hour) map of Es layers on a global scale is available in the hopeful future.</p>

Tidal Signature Detection in Midlatitude Sporadic E Occurrence Rate, Using FORMOSAT-3/COSMIC Radio Occultation Data

2021 ◽  
Author(s):  
Sahar Sobhkhiz ◽  
Yosuke Yamazaki ◽  
Christina Arras
Keyword(s):  
Radio Occultation ◽  
Thin Layers ◽  
Occurrence Rate ◽  
Horizontal Wind ◽  
Cosmic Radio ◽  
Radio Communications ◽  
E Region ◽  
Sporadic E ◽  
Occultation Data ◽  
Radio Occultation Data

<p>Sporadic E (Es) is a transient phenomenon where thin layers of enhanced electron density appear in the ionospheric E region (90-120 km altitude). Es can influence radio propagation, and its global characteristics have been of great interest to radio communications and navigations. Atmospheric diurnal and semidiurnal tides cause horizontal wind shears at E-region heights by giving rise to ions and electrons' vertical motions. These shears will lead to the formation of Es layers. This research aims to study the role of atmospheric solar and lunar tides in Mid-latitude Es occurrence. For this purpose, radio occultation data from FORMASAT-3/COSMIC mission of 11 years (2007 to 2017), which provide complete global coverage, have been used. The results show both lunar and solar tidal signatures in Es occurrence. These tidal signatures are longitudinally dependent, which can result from non-migrating tides or modulation of migrating tidal signatures by zonally varying geomagnetic field.</p>

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