Results 91 to 100 of about 1,105,860 (262)

A Model of the Solar Chromosphere: Structure and Internal Circulation

, 2017
A model of the solar chromosphere that consists of two fundamentally different regions, a lower region and an upper region, is proposed. The lower region is covered mostly by weak locally closed magnetic field and small network areas of extremely strong,
P. Song
semanticscholar   +1 more source

FAST MAGNETIC RECONNECTION IN THE SOLAR CHROMOSPHERE MEDIATED BY THE PLASMOID INSTABILITY [PDF]

, 2015
Magnetic reconnection in the partially ionized solar chromosphere is studied in 2.5 dimensional magnetohydrodynamic simulations including radiative cooling and ambipolar diffusion.
Lei Ni, B. Kliem, Jun Lin, N. Wu
semanticscholar   +1 more source

Decent Estimate of CME Arrival Time From a Data‐Assimilated Ensemble in the Alfvén Wave Solar Atmosphere Model (DECADE‐AWSoM)

Space Weather, Volume 23, Issue 1, January 2025.
Abstract Forecasting the arrival time of Earth‐directed coronal mass ejections (CMEs) via physics‐based simulations is an essential but challenging task in space weather research due to the complexity of the underlying physics and limited remote and in situ observations of these events. Data assimilation techniques can assist in constraining free model
Hongfan Chen, Nishtha Sachdeva, Zhenguang Huang, Bart van der Holst, Ward Manchester IV, Aniket Jivani, Shasha Zou, Yang Chen, Xun Huan, Gabor Toth   +9 more
wiley   +1 more source

Evolutions of various solar indices around sunspot maximum and sunspot minimum years [PDF]

Annales Geophysicae, 2002
The smoothed monthly sunspot numbers showed that in many solar cycles, (a) during years around sunspot maxima, there was only one prominent maximum, but in some cycles there was a broad plateau. If the beginning and end of these are termed as first
R. P. Kane, R. P. Kane
doaj   +1 more source

ON FIBRILS AND FIELD LINES: THE NATURE OF Hα FIBRILS IN THE SOLAR CHROMOSPHERE [PDF]

, 2015
Observations of the solar chromosphere in the line core of the Hα line show dark elongated structures called fibrils that show swaying motion. We performed a three-dimensional radiation-MHD simulation of a network region and computed synthetic Hα images ...
J. Leenaarts, M. Carlsson, L. R. Voort
semanticscholar   +1 more source

Plant‐Based Biosynthesis of Metal and Metal Oxide Nanoparticles: An Update on Antimicrobial and Anticancer Activity

ChemBioEng Reviews, Volume 11, Issue 6, December 2024.
When it comes to finding novel ways to battle newly developing pathogenic strains and illnesses, nanoparticles are the first line of defense. Plant‐based nanoparticles are showing more significance over chemically or physically synthesized nanoparticles. Several plant species and their constituent parts have found several applications in medicine. They
Shruti Nandkishor Tanwar, Yatish R. Parauha, Yogesh There, Hendrik C. Swart, Sanjay J. Dhoble   +4 more
wiley   +1 more source

Nonlinear Instability and Intermittent Nature of Magnetic Reconnection in Solar Chromosphere [PDF]

, 2015
The recent observations of Singh et al. (2012) have shown multiple plasma ejections and the intermittent nature of magnetic reconnection in the solar chromosphere, highlighting the need for fast reconnection to occur in highly collisional plasma. However,
K.A.P. Singh, A. Hillier, H. Isobe, K. Shibata   +3 more
semanticscholar   +1 more source

MEMPSEP‐III. A Machine Learning‐Oriented Multivariate Data Set for Forecasting the Occurrence and Properties of Solar Energetic Particle Events Using a Multivariate Ensemble Approach

Space Weather, Volume 22, Issue 9, September 2024.
Abstract We introduce a new multivariate data set that utilizes multiple spacecraft collecting in‐situ and remote sensing heliospheric measurements shown to be linked to physical processes responsible for generating solar energetic particles (SEPs). Using the Geostationary Operational Environmental Satellites (GOES) flare event list from Solar Cycle ...
Kimberly Moreland, Maher A. Dayeh, Hazel M. Bain, Subhamoy Chatterjee, Andrés Muñoz‐Jaramillo, Samuel T. Hart   +5 more
wiley   +1 more source

Local Empirical Modeling of NmF2 Using Ionosonde Observations and the FISM2 Solar EUV Model

Journal of Geophysical Research: Space Physics, Volume 129, Issue 9, September 2024.
Abstract Local empirical models of the F2 layer peak electron density (NmF2) are developed for 43 low‐ middle latitude ionosonde stations using auto‐scaled data from Lowell GIRO data center and manually scaled data from World Data Center for Ionosphere and Space Weather. Data coverage at these stations ranges from a few years to up to 6 decades.
D. Singh, L. P. Goncharenko, I. A. Galkin, P. C. Chamberlin, F. Redondo   +4 more
wiley   +1 more source

ON THE SPATIAL SCALES OF WAVE HEATING IN THE SOLAR CHROMOSPHERE [PDF]

, 2015
Dissipation of magnetohydrodynamic (MHD) wave energy has been proposed as a viable heating mechanism in the solar chromospheric plasma. Here, we use a simplified one-dimensional model of the chromosphere to theoretically investigate the physical ...
R. Soler, M. Carbonell, J. Ballester
semanticscholar   +1 more source