Results 21 to 30 of about 3,568,047 (295)

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, P. R. Fagundes, J. R. Abalde, A. A. Pimenta, J. A. Bittencourt, Y. Otsuka, V. H. Rios   +6 more
doaj   +1 more source

Effect of genome sequence on the force-induced unzipping of a DNA molecule [PDF]

, 2006
We considered a dsDNA polymer in which distribution of bases are random at the base pair level but ordered at a length of 18 base pairs and calculated its force elongation behaviour in the constant extension ensemble.
Amblard, Bhattacharjee, Cluzel, Cocco, Danilowicz, Essevaz-Roulet, Florin, Lubensky, N. Singh, Peyrard, Peyrard, Singh, Smith, Sponer, Strick, Thompson, Y. Singh   +16 more
core   +1 more source

Multi-instrumented observations of the equatorial F-region during June solstice: large-scale wave structures and spread-F

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, Dustin A. Hickey, Weijia Zhan, Carlos R. Martinis, Bela G. Fejer, Marco A. Milla, Juan F. Arratia   +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, J. D. Huba, G. Joyce, T. Yokoyama   +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, Pornchai Supnithi, Lin Min Min Myint, Kornyanat Hozumi, Donekeo Lakanchanh   +4 more
doaj   +1 more source

Longitudinal differences in the statistical characteristics of ionospheric spread-F occurrences at midlatitude in Eastern Asia

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, Lixin Guo, Zonghua Ding, Zhenwei Zhao, Zhengwen Xu, Tong Xu, Yanli Hu   +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, M. Abdu, I. Batista, G. S. Sales, G. Khmyrov, T. A. Bullett, J. Chau, V. Rios   +7 more
doaj   +1 more source

Propagation of gravity waves and spread F in the low-latitude ionosphere over Tucumán, Argentina, by continuous Doppler sounding: first results [PDF]

, 2014
Results of systematic analysis of propagation directions and horizontal velocities of gravity waves (GWs) and spread F structures in low-latitude ionosphere (magnetic inclination ~27°) in Tucumán region, Argentina, are presented.
Baše, J., Burešová, D., Cabrera, M. A., Cangemi, José Ignacio, Chum, J., Ezquer, Rodolfo Gerardo, Fišer, J., Hruška, F., Ise, Juan Eduardo, Laštovička, J., Miranda Bonomi, Fernando Alberto, Molina, Maria Graciela, Šindelářová, T.   +12 more
core   +2 more sources

Climatology of the spread F over Roquetes, Spain: Impact of the medium scale traveling ionospheric disturbances

Journal of Space Weather and Space Climate
Understanding the long-term variability of nighttime Spread F (SF) and its drivers is crucial for improving the knowledge of ionospheric disturbances, which impact radio communication, GNSS positioning, and space weather forecasting.
Paul Krishnendu Sekhar, Haralambous Haris, Altadill David, Segarra Antoni, Navas-Portella Víctor, de Paula Víctor   +5 more
doaj   +1 more source