Results 41 to 50 of about 353,818 (294)

Cancellation analysis of current density in solar active region NOAA10019

Journal of Space Weather and Space Climate, 2015
Solar flares are often associated with changes in the fine magnetic structure of the emitting active region. Such topological modification results in variations of both the scaling properties of the fields’ fluctuations, and the fractal dimension of the ...
De Vita Gaetano, Vecchio Antonio, Sorriso-Valvo Luca, Briand Carine, Primavera Leonardo, Servidio Sergio, Lepreti Fabio, Carbone Vincenzo   +7 more
doaj   +1 more source

Decoupling Size and Electronic Effects in Doped SrTiO3 Photocatalysts Through Surface Area–Normalized CO2 Hydrogenation Rates

Advanced Functional Materials, EarlyView.
Exploring the photocatalytic reverse water–gas shift (RWGS) reaction on doped SrTiO3 nanoparticle films, reveals that normalizing catalytic rates by the catalyst's specific surface area (SSA) disentangled surface area effects from the catalyst's intrinsic material properties.
Dikshita Bhattacharyya, Baliana Shani, Isaac Holmes‐Gentle, Gerardo T Martinez, Martyn McLachlan, Nicola Seriani, Ludmilla Steier   +6 more
wiley   +1 more source

Turbulence in the Solar Atmosphere: Manifestations and Diagnostics via Solar Image Processing

, 2005
Intermittent magnetohydrodynamical turbulence is most likely at work in the magnetized solar atmosphere. As a result, an array of scaling and multi-scaling image-processing techniques can be used to measure the expected self-organization of solar ...
A. C. Cadavid, A. N. Zhukov, A. O. Benz, B. De Pontieu, B. J. Thompson, B. Mandelbrot, C. J. Schrijver, D. G. Wentzel, D. L. Mickey, D. M. Rust, D. M. Rust, D. Stauffer, E. N. Parker, E. Robbrecht, E. T. Lu, E. T. Lu, F. Cattaneo, G. Einaudi, G. Nicolis, G. Stenborg, H. G. E. Hentschel, H. S. Hudson, I. De Moortel, J. Chae, J. K. Lawrence, J. K. Lawrence, J. K. Lawrence, J. Polygiannakis, J. Qiu, K. Janßen, K. L. Harvey, K. Tziotziou, L. Vlahos, L. Vlahos, L. Vlahos, M. Georgoulis, M. J. Aschwanden, M. K. Georgoulis, M. K. Georgoulis, M. K. Georgoulis, M. K. Georgoulis, M. Turmon, Manolis K. Georgoulis, N. Meunier, N. Meunier, P. Bak, P. Bak, P. Charbonneau, P. Dmitruk, P. E. Seiden, R. H. Kraichnan, S. W. Kahler, S. W. McIntosh, T. G. Forbes, T. Roudier, T. Shimizu, U. Frisch, V. Abramenko, V. Aletti, V. Archontis, V. I. Abramenko, V. I. Abramenko, V. I. Abramenko, W. Biskamp   +63 more
core   +2 more sources

The Nature of Solar Polar Rays [PDF]

, 2000
We use time series observations from the SOHO and Yohkoh spacecraft to study solar polar rays. Contrary to our expectations, we find that the rays are associated with active regions on the sun and are not features of the polar coronal holes.
Barry LaBonte, David Jewitt, Inhester B., Jing Li   +3 more
core   +2 more sources

The evolution of a spot–spot-type solar active region which produced a major solar eruption

Frontiers in Astronomy and Space Sciences, 2023
Solar active regions are the main sources of large solar flares and coronal mass ejections. It is found that the active regions producing large eruptions usually show compact, highly sheared polarity inversion lines.
Lijuan Liu, Lijuan Liu, Lijuan Liu
doaj   +1 more source

Backbone Heterojunction Photocatalysts for Efficient Sacrificial Hydrogen Production

Advanced Functional Materials, EarlyView.
Herein, a ‘single‐component’ organic semiconductor photocatalyst is presented in which a molecular donor is bonded to a polymer acceptor. The resultant material demonstrates exceptional photocatalytic activity for hydrogen evolution in aqueous triethylamine with an outstanding external quantum efficiency of 38% at 420 nm.
Richard J. Lyons, Rhys J. Bourhill, Ewan McQueen, Sam D. Harding, Krzysztof Pawlak, Thomas Fellowes, Harry W. Capps, Alexander J. Cowan, Andrew I. Cooper, Adrian M. Gardner, Martijn A. Zwijnenburg, Reiner Sebastian Sprick   +11 more
wiley   +1 more source

The Radial Distribution of Magnetic Helicity in the Solar Convective Zone: Observations and Dynamo Theory

, 2005
We continue our attempt to connect observational data on current helicity in solar active regions with solar dynamo models. In addition to our previous results about temporal and latitudinal distributions of current helicity (Kleeorin et al.
Baker, Bao, Bao, Bao, Benevolenskaya, Benevolenskaya, Blackman, Brandenburg, Brandenburg, Brandenburg, Choudhuri, Collin, Covas, Covas, D. Moss, D. Sokoloff, Galitski, Gruzinov, H. Zhang, I. Rogachevskii, K. Kuzanyan, Kleeorin, Kleeorin, Kleeorin, Kleeorin, Kleeorin, Krause, Kuzanyan, Kuzanyan, Kuzanyan, Longcope, Makarov, Moffatt, Moss, N. Kleeorin, Obridko, Ossendrijver, Parker, Pevtsov, Pouquet, Rogachevskii, Rogachevskii, Rüdiger, Schou, Seehafer, Spiegel, Spruit, Subramanian, Tobias, Tobias, V. Lamburt, Vishniac, Zhang, Zhang, Zhang   +54 more
core   +2 more sources

Validation of the magnetic energy vs. helicity scaling in solar magnetic structures [PDF]

, 2014
We assess the validity of the free magnetic energy - relative magnetic helicity diagram for solar magnetic structures. We used two different methods of calculating the free magnetic energy and the relative magnetic helicity budgets: a classical, volume ...
Archontis, V., Georgoulis, M. K., Moraitis, K., Tziotziou, K.   +3 more
core   +3 more sources

Magnetic Fields of Solar Active Regions [PDF]

Proceedings of the International Astronomical Union, 2004
After briefly summarizing the outstanding achievements and new tendencies witnessed in recent years in the studies of magnetic fields of solar active regions (ARs), we focus on the current understanding on flux appearance and disappearance. On flux appearance, the moving magnetic features (MMFs) stand still as a mystery in solar physics, although the ...
openaire   +1 more source

Near‐Infrared Organic Photovoltaic Electrodes for Subretinal Neurostimulation

Advanced Functional Materials, EarlyView.
Organic photovoltaic electrodes based on the D18:Y6 blend enable precise and light‐controlled activation of retinal ganglion cells in a degenerating retina. NIR Light‐driven activation of retinal ganglion cells, tunable stimulation parameters, and biocompatibility with human retinal organoids highlight their potential for next‐generation prosthetics ...
Andrea Corna, Katarina Gugujonovic, Manuela Schiek, Alessandro Bellapianta, Paul Werginz, Amelie Ziller, Markus Clark Scharber, Ahmad Salti, Matthias Bolz, Mihai Irimia‐Vladu, Günther Zeck   +10 more
wiley   +1 more source