Results 31 to 40 of about 87,822 (293)

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   +1 more source

Interpretability and Representability of Commutative Algebra, Algebraic Topology, and Topological Spectral Theory for Real-World Data. [PDF]

Adv Intell Discov
This article investigates how persistent homology, persistent Laplacians, and persistent commutative algebra reveal complementary geometric, topological, and algebraic invariants or signatures of real‐world data. By analyzing shapes, synthetic complexes, fullerenes, and biomolecules, the article shows how these mathematical frameworks enhance ...
Ren Y, Wei GW.
europepmc   +2 more sources

Studies of ionospheric F-region response in the Latin American sector during the geomagnetic storm of 21–22 January 2005 [PDF]

, 2011
In the present investigation, we have studied the response of the ionospheric F-region in the Latin American sector during the intense geomagnetic storm of 21–22 January 2005. This geomagnetic storm has been considered "anomalous" (minimum Dst reached
A. J. de Abreu, C.-S. Huang, F. L. Guarnieri, G. Crowley, J. A. Bittencourt, J. R. Abalde, P. R. Fagundes, R. de Jesus, T. Kikuchi, V. G. Pillat, Y. Sahai   +10 more
core   +1 more source

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

Radar Observations of 8.3-m scale equatorial spread F irregularities over Trivandrum [PDF]

Annales Geophysicae, 2004
In this paper, we present observations of equatorial spread F (ESF) irregularities made using a newly installed 18MHz radar located at Trivandrum. We characterize the morphology and the spectral parameters of the 8.3-m ESF irregularities which are ...
D. Tiwari, A. K. Patra, C. V. Devasia, R. Sridharan, N. Jyoti, K. S. Viswanathan, K. S. V. Subbarao   +6 more
doaj   +1 more source

Effect of equatorial ionization anomaly on the occurrence of spread-F [PDF]

Annales Geophysicae, 1997
The unique geometry of the geomagnetic field lines over the equatorial ionosphere coupled with the E-W electric field causes the equatorial ionization anomaly (EIA) and equatorial spread-F (ESF).
P. T. Jayachandran, P. Sri Ram, V. V. Somayajulu, P. V. S. Rama Rao   +3 more
doaj   +1 more source

Equatorial spread F studies using SAMI3 with two-dimensional and three-dimensional electrostatics [PDF]

Annales Geophysicae, 2013
This letter presents a study of equatorial F region irregularities using the NRL SAMI3/ESF model, comparing results using a two-dimensional (2-D) and a three-dimensional (3-D) electrostatic potential solution. For the 3-D potential solution, two cases
H. C. Aveiro, J. D. Huba
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

Ignition latitude and the shape of Type I X-ray bursts [PDF]

, 2007
The shape of the lightcurve during the rising phase of Type I X-ray bursts is determined by many factors including the ignition latitude, the accretion rate, and the rotation rate of the star. We develop a phenomenological model of the burst rise process
Anna L. Watts, Arnett, Ayasli, Bhattacharyya, Bhattacharyya, Bhattacharyya, Bhattacharyya, Bhattacharyya, Bildsten, Bildsten, Bildsten, Brown, Casares, Chakrabarty, Cooper, Cooper, Cooper, Cornelisse, Cumming, Done, Fryxell, Fryxell, Fujimoto, Fushiki, Fushiki, Galloway, Galloway, Galloway, Hanawa, Hartman, Hasinger, Immanuel Maurer, Inogamov, Lattimer, Lewin, Lewin, Markwardt, Miller, Morsink, Muno, Muno, Narayan, Peng, Poutanen, Poutanen, Shaposhnikov, Shara, Smith, Spitkovsky, Strohmayer, Strohmayer, Strohmayer, Strohmayer, Taam, Taam, Van Der Klis, Villarreal, Watts, Watts, Weinberg, Woosley, Zhang, Zingale   +62 more
core   +4 more sources