On the Results of a Special Experiment on the Registration of Traveling Ionospheric Disturbances by a System of Synchronously Operating Chirp Ionosondes

Special Experiment ◽

Traveling Ionospheric Disturbances ◽

Spatial Dimensions

We present the results of observations of traveling ionospheric disturbances (TIDs) based on the data of the operation of the network of chirp oblique sounding stations of the ionosphere on 18–19 December 2019. For observations, four stations of the same type located in Vasilsursk (56.3° N; 46.08° E), Yoshkar-Ola (56.62° N; 47.87° E), Kazan (55.8° N; 49.12° E), and Nizhny Novgorod (56.32° N; 44.02° E) were used. They formed six synchronous sounding paths with lengths from 120 km to 320 km. The registration of the amplitude-frequency and distance-frequency characteristics (AFC and DFC) by the chirp oblique sounding stations was carried out every minute. Additionally, two vertical sounding stations of the ionosphere as ionosondes CADI and Cyclone (Vasilsursk and Kazan) were used. The passage of several types of TIDs has been observed. Based on the measurements of the DFC of the ionosphere, as obtained on different paths by simultaneously operated chirp stations, and ionograms obtained by vertical ionosondes, estimates of the spatial dimensions and TID velocity were made, and their direction was identified.

2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science ◽

Wave-Optics Analysis of HF Propagation through Traveling Ionospheric Disturbances and Developing Plasma Bubbles

10.23919/ursigass49373.2020.9232348 ◽

2020 ◽

Author(s):

Charles S. Carrano ◽

John M. Retterer ◽

Keith M. Groves ◽

Geoff Crowley ◽

Timothy M. Duly ◽

...

Keyword(s):

Wave Optics ◽

Traveling Ionospheric Disturbances ◽

Plasma Bubbles ◽

Hf Propagation

Medium‐Scale Traveling Ionospheric Disturbances

Geophysical Monograph Series - Ionosphere Dynamics and Applications ◽

10.1002/9781119815617.ch18 ◽

2021 ◽

pp. 421-437

Author(s):

Yuichi Otsuka

Keyword(s):

Medium Scale ◽

Characteristics of Medium-Scale Traveling Ionospheric Disturbances and Ionospheric Irregularities at Mid-Latitudes Revealed by the Total Electron Content Associated With the Beidou Geostationary Satellite

IEEE Transactions on Geoscience and Remote Sensing ◽

10.1109/tgrs.2020.3032741 ◽

2020 ◽

pp. 1-7

Author(s):

Fuqing Huang ◽

Jiuhou Lei ◽

Yuichi Otsuka ◽

Xiaoli Luan ◽

Yu Liu ◽

...

Keyword(s):

Total Electron Content ◽

Geostationary Satellite ◽

Ionospheric Irregularities ◽

Electron Content ◽

Total Electron ◽

Medium Scale ◽

Climatological study of GPS total electron content variations caused by medium-scale traveling ionospheric disturbances

Journal of Geophysical Research Atmospheres ◽

10.1029/2005ja011418 ◽

2006 ◽

Vol 111 (A4) ◽

Cited By ~ 94

Author(s):

N. Kotake ◽

Y. Otsuka ◽

T. Tsugawa ◽

T. Ogawa ◽

A. Saito

Keyword(s):

Total Electron Content ◽

Electron Content ◽

Total Electron ◽

Medium Scale ◽

Statistical study of medium-scale traveling ionospheric disturbances in low-latitude ionosphere using an automatic algorithm

Earth Planets and Space ◽

10.1186/s40623-021-01432-1 ◽

2021 ◽

Vol 73 (1) ◽

Author(s):

Pin-Hsuan Cheng ◽

Charles Lin ◽

Yuichi Otsuka ◽

Hanli Liu ◽

Panthalingal Krishanunni Rajesh ◽

...

Keyword(s):

Climate Model ◽

Geomagnetic Latitude ◽

Detection Algorithm ◽

Support Vector ◽

Electron Content ◽

Low Latitude ◽

Total Electron ◽

Medium Scale ◽

AbstractThis study investigates the medium-scale traveling ionospheric disturbances (MSTIDs) statistically at the low-latitude equatorial ionization anomaly (EIA) region in the northern hemisphere. We apply the automatic detection algorithm including the three-dimensional fast Fourier transform (3-D FFT) and support vector machine (SVM) on total electron content (TEC) observations, derived from a network of ground-based global navigation satellite system (GNSS) receivers in Taiwan (14.5° N geomagnetic latitude; 32.5° inclination), to identify MSTID from other waves or irregularity features. The obtained results are analyzed statistically to examine the behavior of low-latitude MSTIDs. Statistical results indicate the following characteristics. First, the southward (equatorward) MSTIDs are observed almost every day during 0800–2100 LT in Spring and Winter. At midnight, southward MSTIDs are more discernible in Summer and majority of them are propagating from Japan to Taiwan. Second, northward (poleward) MSTIDs are more frequently detected during 1200–2100 LT in Spring and Summer with the secondary peak of occurrence between day of year (DOY) 100–140 during 0000–0300 LT. The characteristics of the MSTIDs are interpreted with additional observations from radio occultation (RO) soundings of FORMOSAT-3/COSMIC as well as modeled atmospheric waves from the high-resolution Whole Atmosphere Community Climate Model (WACCM) suggesting that the nighttime MSTIDs in Summer is likely connected to the atmospheric gravity waves (AGWs).