Results 51 to 60 of about 716 (136)

Fundamental Poloidal Wave Event Extending From Midnight to Dawn

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Fundamental poloidal (P1) waves are a class of magnetospheric standing Alfvén waves characterized by field line oscillations in the meridional plane. P1 waves are infrequently excited in the ring current region and are believed to be the source of giant pulsations (Pgs) observed on the ground. Pgs are mostly detected on the morning side with a
Kazue Takahashi, Michael D. Hartinger, Kiyokazu Koga   +2 more
wiley   +1 more source

The Uniturbulence and Alfvén Wave Solar Model (UAWSoM) in MPI-AMRVAC

Astronomy & Astrophysics
Context. The coronal heating problem and the generation of the solar wind remain fundamental challenges in solar physics. While approaches based on, e.g., the Alfvén Wave Solar Model (AWSoM) have proven highly successful in reproducing the large-scale ...
McMurdo M., Van Doorsselaere T., Magyar N., Banović L., Lim D.   +4 more
doaj   +1 more source

Measurements of the Alfven wave spectrum in TCA [PDF]

AIP Conference Proceedings, 1985
Note: Proc. 6th Topical Conference on Radio Frequency Plasma Heating, Callaway Gardens, Pine Mountains, Georgia, U.S.A. May 1985, 16 - 19 (1985) Reference CRPP-CONF-1985-004 Record created on 2008-05-13, modified on 2017-05 ...
Collins, GA, Keller, R, Lietti, A, Lister, JB, Pochelon, A, Villard, L   +5 more
openaire   +5 more sources

Alfvénic Poynting Flux Characterized by a Substorm‐SMC Cycle and Ionospheric Influence

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Geomagnetic substorms are fundamental processes of explosive geospace energy release within the Earth's magnetotail, which are usually divided into three phases: the growth phase, the expansion phase, and the recovery phase. Large‐scale electromagnetic energy transport during a geomagnetic substorm is in the form of Alfvén waves, transmitting ...
Qianfeng Yin, Enhao Feng, Binzheng Zhang, William Lotko, Kevin Pham, Zhiqi Zheng, Ziyi Yang, Tong Dang, Huishan Fu, Oliver Brambles   +9 more
wiley   +1 more source

Chromospheric Damping of Alfven Waves

The Astrophysical Journal, 2001
We analytically study the damping of Alfven mode oscillations in the chromosphere and in coronal loops. In the partially ionized chromosphere the dominant damping process of Alfven waves is due to collisions between ions and neutrals. We calculate the damping time for Alfven waves of a given frequency, propagating through model chromospheres of various
B. De Pontieu, P. C. H. Martens, H. S. Hudson   +2 more
openaire   +1 more source

TRACERS Small‐Scale Field‐Aligned Currents and Intense GPS Amplitude and Phase Scintillations in the Nightside Auroral Region

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract We present conjugate observations of ionospheric small‐scale magnetic perturbations (dB) $(dB)$ and GPS scintillations from the Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) and the Canadian High Arctic Ionospheric Network (CHAIN) during a storm‐time substorm on 9 August 2025 in the nightside auroral region ...
Yangyang Shen, Robert J. Strangeway, Hao Cao, James M. Weygand, Jiashu Wu, Anthony McCaffrey, P. T. Jayachandran, Daniel Billett, Magnus F. Ivarsen, Christopher Watson, Sheng Tian, Marit Oieroset, David Miles   +12 more
wiley   +1 more source

The flux of Alfven waves in sunspots

The Astrophysical Journal, 1976
Under the assumption that the horizontal velocities observed in the sunspot photosphere are caused by Alfven waves, the flux of these waves in the photosphere is found to be equal to 20--50 percent of the missing sunspot flux or 2--3 times the spot's flux of electromagnetic radiation.
openaire   +1 more source

MMS Observations of the Energetic Particles Within Kelvin‐Helmholtz Waves at the Boundary of the 10 May 2024 Coronal Mass Ejection (CME)

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract On 10 May 2024, Earth was hit by a CME that drove the largest geomagnetic storm in 20 years. Multi‐spacecraft observations previously showed that the ∼100 nT north‐south IMF bz ${b}_{z}$ variation was driven by Kelvin‐Helmholtz waves with wavelength ∼250 RE ${R}_{E}$ and reconnection jets in the ±z $\pm z$‐direction (Nykyri, 2024a, https://doi.
Katariina Nykyri, Neetasha Arya, Scott Boardsen, Guan Le, Harri Laakso, Lynn Wilson, Xuanye Ma, Katherine Holland, Brandon Burkholder, Leon Ofman, Kyoung‐Joo Hwang, Dinesh Radhakrishnan, Shiva Kavosi, Daniel Gershman, Christine Gabrielse, Barbara Giles, Stephen Fuselier, Jim Burch   +17 more
wiley   +1 more source

Viscous and Magnetic Boundary Layers at the Top of the Core in Geodynamo Models

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 7, July 2026.
Abstract We investigate the boundary layer at the top of the Earth's core, which acts as a filter between the interior of the core and its surface, where models built from geomagnetic data are derived. We rely on no‐slip convective geodynamo numerical simulations calculated for a low viscosity fluid, with Ekman numbers E=10−6 $E=1{0}^{-6}$ and E=10−7 ...
D. Jault, P. Personnettaz, N. Gillet, T. Lepage, N. Schaeffer   +4 more
wiley   +1 more source

Alfven Waves in the Solar Atmosphere

, 2012
Alfven waves are considered to be viable transporters of the non-thermal energy required to heat the Sun's quiescent atmosphere. An abundance of recent observations, from state-of-the-art facilities, have reported the existence of Alfven waves in a range of chromospheric and coronal structures.
Mathioudakis, Mihalis, Jess, David, Erdelyi, Robertus   +2 more
openaire   +2 more sources