Results 51 to 60 of about 2,789 (225)

Machine Learning for Local Detection of Separators in Three‐Dimensional Magnetic Fields

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Magnetic reconnection is a major plasma phenomenon occurring in various key environments ranging from the Sun and near‐Earth space to astrophysical plasmas. While magnetic reconnection is relatively well‐understood under two‐dimensional (2D) settings, it remains challenging to characterize in three‐dimensional (3D) magnetic fields.
Fanni Franssila, Markku Alho, Ioanna Bouri, Daniel Holmberg, Minna Palmroth, Teemu Roos   +5 more
wiley   +1 more source

Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?

The Astrophysical Journal, 2023
We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions.
Michael Hahn, Mahboubeh Asgari-Targhi, Daniel Wolf Savin   +2 more
doaj   +1 more source

Future high-resolution and high-cadence observations for unraveling small-scale explosive solar features

Frontiers in Astronomy and Space Sciences, 2023
Solar coronal jets are frequently occurring collimated ejections of solar plasma, originating from magnetically mixed polarity locations on the Sun of size scale comparable to that of a supergranule.
Alphonse C. Sterling, Ronald L. Moore, Ronald L. Moore, Navdeep K. Panesar, Navdeep K. Panesar, Tanmoy Samanta, Sanjiv K. Tiwari, Sanjiv K. Tiwari, Sabrina L. Savage   +8 more
doaj   +1 more source

Identifying and Predicting Coronal Mass Ejection Occurrence: Observational Checklists for Space Weather Forecasters

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Ejections of magnetized plasma from the Sun, known as coronal mass ejections, can drive major geomagnetic activity if Earth‐directed, and are therefore monitored by space weather forecasters. The current focus being the forecast of the arrival time of a coronal mass ejection at Earth and the level of geomagnetic impact.
L. M. Green, A. W. James, N. Ngampoopun, S. L. Yardley, K. Waite, E. K. Mottram, J. Hernandez Camero, J. O'kane   +7 more
wiley   +1 more source

Statistical evidence for the existence of Alfvénic turbulence in solar coronal loops

, 2014
The authors acknowledge support from NASA contracts NNX08BA99G, NNX11AN98G, NNM12AB40P, NNG09FA40C (IRIS), and NNM07AA01C (Hinode). The research leading to these results has also received funding from the European Commission Seventh Framework Programme ...
Bethge, C., James Threlfall, Mcintosh, S.W., De Moortel, I., Threlfall, J., Christian Bethge, Liu, J., Scott W. Mcintosh, Jiajia Liu, Ineke De Moortel   +9 more
core   +1 more source

Tracing solar wind plasma entry into the magnetosphere using ion-to-electron temperature ratio [PDF]

, 2009
When the solar wind Mach number is low, typically such as in magnetic clouds, the physics of the bow shock leads to a downstream ion-to-electron temperature ratio that can be notably lower than usual.
Rouillard AP, Genot, V., Schwartz, SJ, Bogdanova, Y.V., Borovsky JE, Pu ZY, Sibeck, DG, Sibeck DG, Constantinescu, D., Shen C, Eastwood, JP, Génot, Vincent, Sibeck, D.G., Panov, E, Birn, J, Schwartz, S.J., Fazakerley, A. N., Jacquey, C., Shen, C., Escoubet, CP, Lavraud, B., Dunlop, M. W., Shen, Chao, Frey H, Rouillard, A.P., Volwerk, M., Schwartz SJ, Rouillard, A. P., Berchem, J., Wild JA, Eastwood JP, Bogdanova Y, Génot V, Constantinescu D, Hasegawa, H, Rouillard, AP, Lavraud B, Taylor, M. G. G. T., Dandouras, I, Sibeck, D. G., Berchem J, Dunlop, MW, Taylor MGGT, Panov, E., Jacquey, C, Wild, JA, Constantinescu, D, Hasegawa, H., Schwartz, S. J., Dunlop, M.W., Pu, Z. Y., Wild, James A., Shi, J, Bogdanova, Y, Pu, ZY, Birn J, Taylor, MGGT, Hasegawa H, Frey, H., Shi, J., Dandouras, I., Birn, J., Lavraud, B, Fazakerley, AN, Bogdanova, Y., Fazakerley, A.N., Genot, V, Escoubet CP, Dunlop MW, Borovsky, JE, Wild, J. A., Dandouras I, Berchem, J, Shen, C, Escoubet, C.P., Jacquey C, Taylor, M.G.G.T., Volwerk M, Volwerk, M, Borovsky, J.E., Panov E, Eastwood, J.P., Frey, H, Pu, Z.Y., Eastwood, J. P., Escoubet, C. P., Shi J, Borovsky, J. E., Fazakerley AN   +88 more
core   +1 more source

Phase-space Analysis of Ordered and Disordered Nonthermal Ion Energization during Magnetic Reconnection

The Astrophysical Journal, 2023
Anomalous ion heating is frequently observed to accompany magnetic reconnection, yet there is little consensus on its origin. Instead of the usual velocity-space analysis, we use phase-space analysis to exhaustively explain how ions are nonthermally ...
Young Dae Yoon, Paul M. Bellan, Gunsu S. Yun   +2 more
doaj   +1 more source

Space Weather Effects From Moderate to Severe Geomagnetic Storms in October 2024 Over the Latin American Sector

Space Weather, Volume 24, Issue 6, June 2026.
Abstract This study presents a detailed case study of the ionospheric impacts of moderate (G2) and severe (G4) geomagnetic storms over the Latin American sector, with particular emphasis on the formation and suppression of equatorial plasma bubbles (EPBs).
C. S. Carmo, L. Dai, C. M. Wrasse, D. Barros, H. Takahashi, J. R. Costa, L. F. R. Vital, P. R. Jauer, C. De La Jara, A. J. Carrasco, C. A. O. B. Figueiredo, C. Wang, H. Li, Z. Liu   +13 more
wiley   +1 more source

Energy and Mass Transport Associated with Impulsive Spicular Flows in Solar Coronal Holes

The Astrophysical Journal Letters
How the solar atmosphere is heated from a temperature of about 5000 to 6000 K in the lower atmosphere to about 1–2 MK in the corona has challenged the astrophysical community for nearly 80 yr.
Lei Ni, Jun Lin, Tanmoy Samanta, Guanchong Cheng, Yifu Wang, Robert Erdélyi   +5 more
doaj   +1 more source

Terrestrial Space Weather Protection Through Human‐Produced Mass‐Loading

Space Weather, Volume 24, Issue 6, June 2026.
Abstract While humans become more reliant on Earth's space environment, the potential for significant harm from severe space weather continues to grow. As structures from the sun reach Earth's magnetosphere and space environment, they deposit energy that fuels geomagnetic storms.
B. M. Walsh, D. T. Welling, Z. Huang
wiley   +1 more source