Results 71 to 80 of about 10,729 (219)

Recent Observations of Plasma and Alfvenic Wave Energy Injection at the Base of the Fast Solar Wind

, 2012
We take stock of recent observations that identify the episodic plasma heating and injection of Alfvenic energy at the base of fast solar wind (in coronal holes).
McIntosh, Scott W.
core   +1 more source

Energy Conversion Pathways Inside Kelvin‐Helmholtz Vortices

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Energy transfer, cross‐scale coupling, and dissipation in astrophysical plasmas remain fundamental unresolved problems. The velocity‐shear–driven Kelvin–Helmholtz instability (KHI), ubiquitous in plasmas, is a key multiscale mechanism enabling plasma mixing, particle energization and the solar wind–magnetosphere coupling, making it a critical ...
A. Settino, Z. Vörös, L. Sorriso‐Valvo, C. Simon‐Wedlund, O. W. Roberts, R. Nakamura   +5 more
wiley   +1 more source

Solar wind from high‐latitude coronal holes at solar maximum [PDF]

Geophysical Research Letters, 2002
In this study we combine Ulysses' observations from the solar wind plasma (SWOOPS) and ion composition (SWICS) instruments to study high‐latitude coronal holes near solar maximum for the first time. While chromospheric and coronal composition signatures indicate that there is a unique type of solar wind, which flows from coronal holes, variations in ...
D. J. McComas, H. A. Elliott, R. von Steiger   +2 more
openaire   +1 more source

Preferential energization of alpha particles in polar coronal holes at one solar radius above the photosphere

, 2015
Heating of polar coronal holes during solar minimum and acceleration of the fast solar wind issuing therefrom lack comprehensive theoretical understanding.
Bose, M., Chakravarty, Aniruddha
core   +1 more source

Low-latitude coronal holes, decaying active regions and global coronal magnetic structure [PDF]

, 2013
We study the relationship between decaying active region magnetic fields, coronal holes and the global coronal magnetic structure using Global Oscillations Network Group (GONG) synoptic magnetograms, Solar Terrestrial RElations Observatory (STEREO ...
Haislmaier, Karl, Petrie, Gordon
core   +1 more source

Characterization of Mercury's Atomic and Molecular Hydrogen Exosphere and the First Detection of H2 Ions

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract From 1974 to 1975, the Mariner 10 spacecraft studied Mercury's environment during three flybys and detected hydrogen, helium, and possibly atomic oxygen in the exosphere using its ultraviolet spectrometer, but no molecular hydrogen. Based on the sensitivity of the occultation instrument, an upper limit for the H2 ${\mathrm{H}}_{2}$ surface ...
F. Weichbold, D. Schmid, H. Lammer, M. Volwerk, M. Scherf, N. V. Erkaev, A. Varsani, C. Simon Wedlund, C. Mazelle   +8 more
wiley   +1 more source

On the Origin of the Sudden Heliospheric Open Magnetic Flux Enhancement During the 2014 Pole Reversal

The Astrophysical Journal
Coronal holes are recognized as the primary sources of heliospheric open magnetic flux (OMF). However, a noticeable gap exists between in situ measured OMF and that derived from remote-sensing observations of the Sun.
Stephan G. Heinemann, Mathew J. Owens, Manuela Temmer, James A. Turtle, Charles N. Arge, Carl J. Henney, Jens Pomoell, Eleanna Asvestari, Jon A. Linker, Cooper Downs, Ronald M. Caplan, Stefan J. Hofmeister, Camilla Scolini, Rui F. Pinto, Maria S. Madjarska   +14 more
doaj   +1 more source

Calibrating Probabilistic Solar‐Wind Forecasts Driven by the Wang‐Sheeley‐Arge Model

Space Weather, Volume 24, Issue 3, March 2026.
Abstract By spatially perturbing coronal model output within a coupled coronal‐heliospheric model we can generate probabilistic predictions of solar‐wind speed. We apply these spatial perturbations to the Wang‐Sheeley‐Arge (WSA) model output to generate large sets of input conditions for the Heliospheric Upwind eXtrapolation with time dependence (HUXt)
N. O. Edward‐Inatimi, M. J. Owens, L. Barnard, H. Turner, M. Marsh, S. Gonzi, M. Lang   +6 more
wiley   +1 more source

Comparing extrapolations of the coronal magnetic field structure at 2.5 solar radii with multi-viewpoint coronagraphic observations [PDF]

, 2019
The magnetic field shapes the structure of the solar corona but we still know little about the interrelationships between the coronal magnetic field configurations and the resulting quasi-stationary structures observed in coronagraphic images (as ...
Abbo, L., Andretta, V., Antonucci, E., Bemporad, A., Da Deppo, V., Dolei, S., Fineschi, S., Frassetto, F., Howard, R. A., Landini, F., Naletto, G., Nicolini, G., Nicolosi, P., Pancrazzi, M., Pinto, R. F., Romoli, M., Sasso, C., Spadaro, D., Susino, R., Telloni, D., Ventura, R., Vourlidas, A.   +21 more
core   +4 more sources

Coronal and Chromospheric Dynamics of a Coronal Hole Bright Point

The Astrophysical Journal
Data from the Atmospheric Imaging Assembly (AIA) and the Helioseismic Magnetic Imager on board the Solar Dynamics Observatory and from the Interface Region Imaging Spectograph, are used to study the evolution at different atmospheric layers of a bright ...
Ana Cristina Cadavid, Mari Paz Miralles
doaj   +1 more source