Results 1 to 10 of about 92,748 (240)

Resolution of the equatorial spread F problem: Revisited

Frontiers in Astronomy and Space Sciences, 2023
An overview of recent advances made in understanding the phenomenon of equatorial spread F (ESF) is presented and a discussion of unresolved issues that need to be addressed. The focus is on research that has occurred in the last decade.
J. D. Huba
doaj   +3 more sources

Global Modeling of Equatorial Spread F with SAMI3/WACCM‐X

Geophysical Research Letters, 2020
We report the first results of a global ionosphere/thermosphere simulation study that self‐consistently generates large‐scale equatorial spread F (ESF) plasma bubbles in the postsunset ionosphere.
J. D. Huba, H.‐L. Liu
doaj   +3 more sources

Regional simulations of equatorial spread F driven with, and an analysis of, WAM-IPE electric fields

Frontiers in Physics
A three-dimensional, regional simulation is used to investigate ionospheric plasma density irregularities associated with Equatorial Spread F. This simulation is first driven with background electric fields derived from ISR observations.
Aaron Kirchman, David Hysell, Tzu-Wei Fang   +2 more
doaj   +4 more sources

The Effect of Plasma Releases on Equatorial Spread F—a Simulation Study

Frontiers in Astronomy and Space Sciences, 2019
A currently unfulfilled goal of active experimentalists is to control the occurrence of instabilities in the ionosphere such as Equatorial Spread F (ESF), which generates large-scale electron density depletions (plasma bubbles) in the night-time ...
Katherine A. Zawdie, Joseph D. Huba, Manbharat S. Dhadly, Manbharat S. Dhadly, Konstantinos Papadopoulos   +4 more
doaj   +4 more sources

Topside equatorial spread F-related field-aligned Poynting flux: observations and simulations

Earth, Planets and Space, 2022
Electric and magnetic field data from the Swarm constellation mission are used to report on the Poynting flux associated with postsunset topside equatorial spread F.
J. Rodríguez-Zuluaga, C. Stolle, D. Hysell, D. J. Knudsen   +3 more
doaj   +2 more sources

Equatorial spread-F forecasting model with local factors using the long short-term memory network

Earth, Planets and Space, 2023
The predictability of the nighttime equatorial spread-F (ESF) occurrences is essential to the ionospheric disturbance warning system. In this work, we propose ESF forecasting models using two deep learning techniques: artificial neural network (ANN) and ...
Phimmasone Thammavongsy, Pornchai Supnithi, Lin Min Min Myint, Kornyanat Hozumi, Donekeo Lakanchanh   +4 more
doaj   +2 more sources

Modeling Post-Sunset Equatorial Spread-F Occurrence as a Function of Evening Upward Plasma Drift Using Logistic Regression, Deduced from Ionosondes in Southeast Asia

Remote Sensing, 2022
The occurrence of post-sunset equatorial spread-F (ESF) could have detrimental effects on trans-ionospheric radio wave propagation used in modern communications systems.
Prayitno Abadi, Umar Ali Ahmad, Yuichi Otsuka, Punyawi Jamjareegulgarn, Dyah Rahayu Martiningrum, Agri Faturahman, Septi Perwitasari, Randy Erfa Saputra, Reza Rendian Septiawan   +8 more
doaj   +2 more sources

Geomagnetic storm and equatorial spread-F [PDF]

Annales Geophysicae, 2004
In August 2000, a new ionospheric sounding station was established at Sao Jose dos Campos (23.2° S, 45.9° W; dip latitude 17.6° S), Brazil, by the University of Vale do Paraiba (UNIVAP). Another ionospheric sounding station was established
F. Becker-Guedes, Y. Sahai, P. R. Fagundes, W. L. C. Lima, V. G. Pillat, J. R. Abalde, J. A. Bittencourt   +6 more
doaj   +4 more sources

Daytime Equatorial Spread F‐Like Irregularities Detected by HF Doppler Receiver and Digisonde

Space Weather, 2021
Daytime equatorial spread F (ESF) is not as common as nighttime ESF due to the presence of a highly conducting E‐layer during the daytime which counteracts the development of F‐layer plasma irregularities.
B. Olugbon, E. O. Oyeyemi, A. Kascheyev, A. B. Rabiu, A. A. Obafaye, O. O. Odeyemi, A. O. Adewale   +6 more
doaj   +2 more sources

The Effect of Midnight Temperature Maximum Winds on Post‐Midnight Equatorial Spread F

Space Weather, 2021
The SAMI3/equatorial spread F (Sami3 is also a model of the ionosphere/ESF) code is used to simulate the growth of equatorial plasma bubbles in the presence of a background wind field based on measured winds.
J. Krall, D. Hickey, J. D. Huba, P. B. Dandenault   +3 more
doaj   +2 more sources