Results 61 to 70 of about 14,551 (173)

Scale variability of atmospheric surface layer fluxes of energy and carbon over a tropical rain forest in southwest Amazonia; 1 diurnal conditions [PDF]

, 2002
The aim of this study is to investigate the low-frequency characteristics of diurnal turbulent scalar spectra and cospectra near the Amazonian rain forest during the wet and dry seasons.
Randow, C., von, Manzi, A.O., von Randow, C., Sá, L.D.A., Arlino, P.R.A., Gannabathula, P.S.S.D., Kruijt, B.   +6 more
core   +1 more source

The Making of Delta Sunspots

The Astrophysical Journal
We explore what fraction of delta sunspots with a sharp polarity inversion line (PIL) in photospheric magnetograms are produced by a writhe kink in an emerging twisted flux rope.
Ronald L. Moore, Sanjiv K. Tiwari, V. Aparna, Navdeep K. Panesar, Alphonse C. Sterling   +4 more
doaj   +1 more source

Analysis of sudden variations in photospheric magnetic fields during a large flare and their influences in the solar atmosphere [PDF]

, 2016
The solar active region NOAA 11719 produced a large two-ribbon flare on 2013 April 11. We have investigated sudden variations in the photospheric magnetic fields in this active region during the flare by employing magnetograms obtained in the spectral ...
B. Kumar, A. R. Bayanna, P. Venkatakrishnan, S. Mathew   +3 more
semanticscholar   +1 more source

Magnetohydrodynamic waves in structured atmospheres [PDF]

, 2012
The effect of structuring, in the form of magnetic or density inhomogeneities, on the magnetohydrodynamic (mhd) waves of an infinite plasma is investigated.
Edwin, Patricia Mary
core  

The tangential discontinuous surface of velocity in solar chromosphere [PDF]

, 1991
The data of velocity and magnetic fields in the solar photosphere (5324 angstrom) and the chromosphere (4861 angstrom) clearly show the features of tangential discontinuity of velocity in the chromosphere.
HU, WR (reprint author), ACAD SINICA,INST MECH,BEIJING 100080,PEOPLES R CHINA., 胡文瑞, Zhang HQ, Chen JM   +3 more
core  

ON THE FLARE-INDUCED SEISMICITY IN THE ACTIVE REGION NOAA 10930 AND RELATED ENHANCEMENT OF GLOBAL WAVES IN THE SUN [PDF]

, 2011
A major flare (of class X3.4) occurred on 2006 December 13 in the active region NOAA 10930. This flare event has remained interesting to solar researchers for studies related to particle acceleration during the flare process and the reconfiguration of ...
B. Kumar, P. Venkatakrishnan, S. Mathur, S. Tiwari, R. García   +4 more
semanticscholar   +1 more source

On the Nature of Nonthermal Broadening of Spectral Lines Observed by IRIS

The Astrophysical Journal
The origin of nonthermal broadening in solar spectra is one of the long-standing questions in solar physics. Various processes have been invoked—including unresolved flows, waves, and turbulent processes—but definitive answers are lacking. To investigate
Kyuhyoun Cho, Bart De Pontieu, Paola Testa   +2 more
doaj   +1 more source

First E region observations of mesoscale neutral wind interaction with auroral arcs [PDF]

, 2010
We report the first observations of E region neutral wind fields and their interaction with auroral arcs at mesoscale spatial resolution during geomagnetically quiet conditions at Mawson, Antarctica.
Fiori, R. A. D., Kosch, Mike J., Anderson, C., Makarevich, R. A., Carter, B. A., Davies, T., Conde, M., Dyson, P. L.   +7 more
core  

Data-driven magnetohydrodynamic simulation of the initiation of a coronal mass ejection with multiple stages

Astronomy & Astrophysics
Coronal mass ejections (CMEs) are the primary drivers of adverse space-weather events, yet their initiation and onset prediction remain insufficiently understood due to the complexity of the magnetic topology and physical processes in real solar source ...
Guo J. H., Poedts S., Schmieder B., Guo Y., Zhou C., Wu H., Ni Y. W., Zhong Z., Zhou Y. H., Li S. H., Chen P. F.   +10 more
doaj   +1 more source

The location and kinematics of the emission line regions in Active Galactic Nuclei [PDF]

, 2008
This thesis contains the results from a study of the optical emission lines of various samples of active galactic nuclei (AGN). We have used three separate techniques to determine the precise kinematics and the relative location of the emission line ...
Mullaney, J R, Mullaney, J.R.
core