Results 21 to 30 of about 781,821 (303)
Travel distance, frequency of return, and the spread of disease
Scientific Reports, 2023 Human mobility is a key driver of infectious disease spread. Recent literature has uncovered a clear pattern underlying the complexity of human mobility in cities: $$r \cdot f$$ r · f , the product of distance traveled r and frequency of return f per ...
Cate Heine +4 more
doaj +1 more source
A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms [PDF]
, 2011 Investigation of coupling mechanisms between the troposphere and the ionosphere requires a multidisciplinary approach involving several branches of atmospheric sciences, from meteorology, atmospheric chemistry, and fulminology to aeronomy, plasma physics,
Berthelier, Jean-Jacques +3 more
core +4 more sources
Geophysical Research Letters, 1976 A numerical simulation of the non‐linear evolution of the collisional Rayleigh‐Taylor instability using a set of equations appropriate for the equatorial F region ionosphere has been performed. Our results show that the irregularities produced by the instability grow on the bottomside of the F region peak, as predicted by linear theory, and then the ...
Anthony J. Scannapieco +1 more
openaire +1 more source
Generation of large-scale equatorial F-region plasma depletions during lowrange spread-F season [PDF]
Annales Geophysicae, 2004 All-sky imaging observations of the F-region OI 630nm nightglow emission allow us to visualize large-scale equatorial plasma depletions, generally known as trans-equatorial plasma bubbles. Strong range type spread-F is the radio signature of these
Y. Sahai +6 more
doaj +1 more source
Progress in Earth and Planetary Science, 2018 Typical equatorial spread-F events are often said to occur during post-sunset, equinox conditions in most longitude sectors. Recent studies, however, have found an unexpected high occurrence of ionospheric F-region irregularities during June solstice ...
Fabiano S. Rodrigues +6 more
doaj +1 more source
Density enhancements associated with equatorial spread F [PDF]
Annales Geophysicae, 2010 Forces governing the three-dimensional structure of equatorial spread-F (ESF) plumes are examined using the NRL SAMI3/ESF three-dimensional simulation code.
J. Krall +3 more
doaj +1 more source
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 +4 more
doaj +1 more source
Earth, Planets and Space, 2019 Spread-F is known as the electron density inhomogeneous structures in F layer of ionosphere and can usually be classified as frequency spread-F (FSF) and range spread-F (RSF).
Ning Wang +6 more
doaj +1 more source
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 +1 more source
Multistation digisonde observations of equatorial spread F in South America [PDF]
Annales Geophysicae, 2004 Directional ionogram and F-region drift observations were conducted at seven digisonde stations in South America during the COPEX campaign from October to December 2002.
B. W. Reinisch +7 more
doaj +1 more source