Results 21 to 30 of about 66 (59)

The Propagation and Evolution of Polar Cap Patches During Auroral Substorm Activity

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract Polar cap patches are islands of enhanced plasma density formed during intervals of southward interplanetary magnetic field (IMF). The present study examines the observations of polar cap patches during sequential auroral substorms that occurred on 9 September 2011.
Jianjun Liu, Yaqi Jin, Xiangcai Chen, Zhiwei Wang, Fang He, Zejun Hu, Akira Sessai Yukimatu, William Bristow, Hongqiao Hu, Beichen Zhang   +9 more
wiley   +1 more source

Generalized Force Method for Point‐To‐Point Ray Tracing in Anisotropic Ionosphere: Implementation and Applications to NeQuick2 and IGRF13 Models

Radio Science, Volume 60, Issue 3, March 2025.
Abstract The generalized force method, previously developed for an isotropic inhomogeneous ionosphere, exploits the knowledge about the character of the extrema of the phase distance—where high ionospheric rays correspond to minima and low rays to saddle points—to systematically find all relevant rays between fixed points, thereby enabling efficient ...
I. A. Nosikov, M. V. Klimenko, A. M. Padokhin, V. V. Nosikova, P. F. Bessarab   +4 more
wiley   +1 more source

Application of SuperDARN Interferometry for Improved Estimates of Doppler Velocity and Echo Geolocation

Radio Science, Volume 60, Issue 1, January 2025.
Abstract It has been previously established that the Doppler velocities of F‐region ionospheric echoes observed by the Super Dual Auroral Radar Network (SuperDARN) at high frequencies (HF, 8–20 MHz) are persistently lower than those measured by other instruments at the same locations. This was attributed to the ionospheric refractive index for HF radio
P. Ponomarenko, M. Ghalamkarian Nejad, A. V. Koustov   +2 more
wiley   +1 more source

Multi‐Frequency SuperDARN HF Radar Observations of the Ionospheric Response to the October 2023 Annular Solar Eclipse

Geophysical Research Letters, Volume 51, Issue 24, 28 December 2024.
Abstract An annular solar eclipse was visible on 14 October 2023 from 15:00–21:00 UT as its path traveled across North, Central, and South America. In this letter, we present the first multi‐frequency Super Dual Auroral Radar Network (SuperDARN) observations of the bottomside ionospheric response to a solar eclipse using a novel experimental mode ...
E. G. Thomas, S. G. Shepherd, B. S. R. Kunduri, D. R. Themens   +3 more
wiley   +1 more source

On the Growth and Evolution of Nocturnal Ionospheric Irregularities Using HF Radar Observations Along With Digisonde and GNSS Data Over Trivandrum, India

Space Weather, Volume 22, Issue 11, November 2024.
Abstract The growth and evolution of nocturnal ionospheric plasma irregularities are analyzed over the geomagnetic equatorial station Trivandrum (8.5°N, 77°E, dip latitude 1.9°N) using multi‐instrumental techniques during various seasons of moderate and high solar activity periods.
T. V. Sruthi, G. Manju
wiley   +1 more source

Monitoring of Ionospheric Variability Using the Low lAtitude Long Range Ionospheric raDar (LARID): Capabilities, Advantages and Limitations

Space Weather, Volume 22, Issue 11, November 2024.
Abstract A Low lAtitude long Range Ionospheric raDar (LARID), which was built recently at Dongfang (19.2°N, 108.8°E, magnetic latitude 13.9°), Hainan Is., China, is employed to study the ionospheric variability over a large region. The LARID consists of two high frequency (HF) coherent backscatter radars, looking toward east and west, respectively ...
Wenjie Sun, Guozhu Li, Baiqi Ning, Lianhuan Hu, Yuichi Otsuka, Guofeng Dai, Haiyong Xie, Xiukuan Zhao, Yi Li, Atsuki Shinbori, Michi Nishioka, Septi Perwitasari, Chi Wang   +12 more
wiley   +1 more source

Reimei Satellite Observations of Alfvénic Interaction Modulating Inverted‐V Electrons and Filamentary Auroral Forms at the Poleward Edge of a Discrete Arc

Journal of Geophysical Research: Space Physics, Volume 129, Issue 10, October 2024.
Abstract We present an event based on Reimei satellite observations in the low‐altitude midnight auroral region, showing that intense and clear energy‐dispersed electron precipitations, repetitively generated by field‐aligned accelerations due to dispersive Alfvén waves, were modulating inverted‐V electrons.
Masafumi Hirahara, Yusuke Ebihara, Naritoshi Kitamura, Takeshi Sakanoi, Kazushi Asamura, Taku Takada, Hirobumi Saito   +6 more
wiley   +1 more source

On the Use of SuperDARN Ground Backscatter Measurements for Ionospheric Propagation Model Validation

Space Weather, Volume 22, Issue 9, September 2024.
Abstract Prior to use in operational systems, it is essential to validate ionospheric models in a manner relevant to their intended application to ensure satisfactory performance. For Over‐the‐Horizon radars (OTHR) operating in the high‐frequency (HF) band (3–30 MHz), the problem of model validation is severe when used in Coordinate Registration (CR ...
Joshua J. Ruck, David R. Themens, Pasha Ponomarenko, Angeline G. Burrell, Bharat Kunduri, J. Michael Ruohoniemi, Sean Elvidge   +6 more
wiley   +1 more source

87th Annual Meeting of the Meteoritical Society 2025: Abstracts

Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley   +1 more source

Application of Biphase Complete Complementary Code for Ionospheric Sounding. [PDF]

Sensors (Basel), 2018
Yang G, Duan P, Jiang C, Liu T, Lan T, Zhao Z, Shi S, Xu C.   +7 more
europepmc   +1 more source