Results 21 to 30 of about 11,368 (206)

Ligand-Driven Optimization of Iron Oxide Nanoprobes for In Vivo MRI Enhancement at Ultra-High Field. [PDF]

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Ligand‐tailored iron oxide nanoparticles reveal how surface chemistry controls T2 relaxivity and in vivo performance in ultra‐high‐field MRI. Systematic variation of hydrophilicity and charge across five coatings modulated r2 by up to 333 mm−1 s−1, with chemical properties, rather than shell thickness, dictating magnetic dephasing and enabling reliable
García-Acevedo P, Alonso-Alonso ML, Ortega-Espina S, Bañobre-López M, Piñeiro Y, Iglesias-Rey R, Rivas J.   +6 more
europepmc   +2 more sources

3D Solar Coronal Loop Reconstructions with Machine Learning

The Astrophysical Journal Letters, 2021
Abstract The magnetic field plays an essential role in the initiation and evolution of different solar phenomena in the corona. The structure and evolution of the 3D coronal magnetic field are still not very well known. A way to ascertain the 3D structure of the coronal magnetic field is by performing magnetic field extrapolations from ...
Iulia Chifu, Ricardo Gafeira
openaire   +4 more sources

Commission 10: Solar Activity [PDF]

, 2007
Commission 10 aims at the study of various forms of solar activity, including networks, plages, pores, spots, fibrils, surges, jets, filaments/prominences, coronal loops, flares, coronal mass ejections (CMEs), solar cycle, microflares, nanoflares ...
Benz, A.O., Craig, Ian J.D., Gopalswamy, N., Harrison, R.A., Klimchuk, James A., Kozlovsky, B.Z., Melrose, Donald B., Poletto, G., Schrijver, K.J., Van Driel-Gesztelyi, L., Wang, J.-X.   +10 more
core   +2 more sources

Fleeting Small-scale Surface Magnetic Fields Build the Quiet-Sun Corona

The Astrophysical Journal Letters, 2023
Arch-like loop structures filled with million Kelvin hot plasma form the building blocks of the quiet-Sun corona. Both high-resolution observations and magnetoconvection simulations show the ubiquitous presence of magnetic fields on the solar surface on ...
L. P. Chitta, S. K. Solanki, J. C. del Toro Iniesta, J. Woch, D. Calchetti, A. Gandorfer, J. Hirzberger, F. Kahil, G. Valori, D. Orozco Suárez, H. Strecker, T. Appourchaux, R. Volkmer, H. Peter, S. Mandal, R. Aznar Cuadrado, L. Teriaca, U. Schühle, D. Berghmans, C. Verbeeck, A. N. Zhukov, E. R. Priest   +21 more
doaj   +1 more source

From Coronal Holes to Pulsars and Back Again: Learning the Importance of Data

Frontiers in Astronomy and Space Sciences, 2022
Although wanting to become an astronomer from an early age, I ended up in solar physics purely by chance, after first working in high-energy astrophysics.
Y.-M. Wang
doaj   +1 more source

An AB Initio Approach to Solar Coronal Loops [PDF]

The Astrophysical Journal, 2005
Data from recent numerical simulations of the solar corona and transition region are analysed and the magnetic field connection between the low corona and the photosphere is found to be close to that of a potential field. The fieldline to fieldline displacements follow a power law distribution with typical displacements of just a few Mm.
Gudiksen, Boris V., Nordlund, Å.
openaire   +2 more sources

Dominance of Bursty over Steady Heating of the 4–8 MK Coronal Plasma in a Solar Active Region: Quantification Using Maps of Minimum, Maximum, and Average Brightness

The Astrophysical Journal, 2022
A challenge in characterizing active region (AR) coronal heating is in separating transient (bursty) loop heating from the diffuse background (steady) heating.
Sanjiv K. Tiwari, Lucy A. Wilkerson, Navdeep K. Panesar, Ronald L. Moore, Amy R. Winebarger   +4 more
doaj   +1 more source

On the Nature of the Three-part Structure of Solar Coronal Mass Ejections

The Astrophysical Journal, 2022
Coronal mass ejections (CMEs) result from eruptions of magnetic flux ropes (MFRs) and can possess a three-part structure in white-light coronagraphs, including a bright front, dark cavity, and bright core.
Hongqiang Song, Jie Zhang, Leping Li, Zihao Yang, Lidong Xia, Ruisheng Zheng, Yao Chen   +6 more
doaj   +1 more source

Turbulent cross-field transport of non-thermal electrons in coronal loops: theory and observations [PDF]

, 2011
<p><b>Context:</b> A fundamental problem in astrophysics is the interaction between magnetic turbulence and charged particles. It is now possible to use Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observations of hard X-rays (
A. L. MacKinnon, Antonucci, Aschwanden, Aschwanden, Balescu, Balescu, Bian, Bitane, Brown, Brown, Brown, Bykov, Bykov, Chiueh, Corrsin, Doschek, Doyle, E. P. Kontar, Fludra, Galloway, Hamilton, Hara, Hauff, Hurford, Imada, Isichenko, Jokipii, Kadomtsev, Kontar, Kontar, Kontar, Kosugi, Larosa, Lin, Lin, Lin, Litvinenko, Melrose, Miller, Milovanov, Mrozek, N. H. Bian, Petrosian, Prato, Pérez, Rechester, Saint-Hilaire, Shibata, Somov, Vlad, Xu, Zimbardo   +51 more
core   +2 more sources

The Equilibrium of Coronal Loops Near Separatrices

The Astrophysical Journal, 2023
We present numerical models from the field-aligned HYDrodynamics and RADiation code (HYDRAD) of a highly asymmetric closed coronal loop with near-singular expansion factor.
Emily I Mason, Spiro K Antiochos, Stephen Bradshaw   +2 more
doaj   +1 more source