Results 11 to 20 of about 1,832,653 (172)
Parameter Distributions for the Drag‐Based Modeling of CME Propagation
Space Weather, Volume 20, Issue 9, September 2022., 2022 Abstract In recent years, ensemble modeling has been widely employed in space weather to estimate uncertainties in forecasts. We here focus on the ensemble modeling of Coronal Mass Ejections (CME) arrival times and arrival velocities using a drag‐based model, which is well‐suited for this purpose due to its simplicity and low computational cost ...
Gianluca Napoletano +9 more
wiley +1 more source
Space Weather, Volume 20, Issue 7, July 2022., 2022 Abstract The forecasting of the Time‐of‐Arrival (ToA) of coronal mass ejections (CMEs) to Earth does not yet meet most Space Weather users' requirements. The main physical reason is our incomplete understanding of CME propagation in the inner heliosphere.
Evangelos Paouris, Angelos Vourlidas
wiley +1 more source
The Subaru coronagraphic extreme AO (SCExAO) system: Visible imaging mode [PDF]
, 2020 The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument designed to be inserted between the Subaru AO188 system and the infrared HiCIAO camera in order to greatly improve the contrast in the very close (less than 0.5 ...
Martinache, Frantz +7 more
core +1 more source
A Multi‐Purpose Heliophysics L4 Mission
Space Weather, Volume 19, Issue 9, September 2021., 2021 Abstract The Earth‐Sun Lagrangian point 4 is a meta‐stable location at 1 AU from the Sun, 60° ahead of Earth's orbit. It has an uninterrupted view of the solar photosphere centered on W60, the Earth's nominal magnetic field connection to the Sun. Such a mission on its own would serve as a solar remote sensing observatory that would oversee the entire ...
A. Posner +15 more
wiley +1 more source
A Quarter Century of Wind Spacecraft Discoveries
Reviews of Geophysics, Volume 59, Issue 2, June 2021., 2021 Abstract The Wind spacecraft, launched on November 1, 1994, is a critical element in NASA’s Heliophysics System Observatory (HSO)—a fleet of spacecraft created to understand the dynamics of the Sun‐Earth system. The combination of its longevity (>25 years in service), its diverse complement of instrumentation, and high resolution and accurate ...
Lynn B. Wilson III +13 more
wiley +1 more source
CME Magnetic Structure and IMF Preconditioning Affecting SEP Transport
Space Weather, Volume 19, Issue 4, April 2021., 2021 Abstract Coronal mass ejections (CMEs) and solar energetic particles (SEPs) are two phenomena that can cause severe space weather effects throughout the heliosphere. The evolution of CMEs, especially in terms of their magnetic structure, and the configuration of the interplanetary magnetic field (IMF) that influences the transport of SEPs are currently
Erika Palmerio +17 more
wiley +1 more source
Space Weather, Volume 19, Issue 2, February 2020., 2021 Abstract White light images of coronal mass ejections (CMEs) are projections on the plane‐of‐sky (POS). As a result, CME kinematics are subject to projection effects. The error in the true (deprojected) speed of CMEs is one of the main causes of uncertainty to Space Weather forecasts, since all estimates of the CME time‐of‐arrival (ToA) at a certain ...
Evangelos Paouris +3 more
wiley +1 more source
Deriving CME Density From Remote Sensing Data and Comparison to In‐Situ Measurements
Journal of Geophysical Research: Space Physics, Volume 126, Issue 1, January 2021., 2021 Abstract We determine the three‐dimensional geometry and deprojected mass of 29 well‐observed coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) using combined Solar Terrestrial Relations Observatory ‐ Solar and Heliospheric Observatory white‐light data.
M. Temmer +10 more
wiley +1 more source
Post-coronagraphic PSF sharpening with the vortex coronagraph [PDF]
, 2017 Small-angle coronagraphs are key components for future instruments being developed for the ELTs. Because they deliver high contrast capabilities at small angular separations from the host star, they enable us to address by direct imaging one of the most ...
Orban De Xivry, Gilles +3 more
core +2 more sources
Space Weather Monitor at the L5 Point: A Case Study of a CME Observed with STEREO B
Space Weather, Volume 18, Issue 10, October 2020., 2020 Abstract An important location for future space weather monitoring is the Lagrange point 5 (L5) of the Sun‐Earth system. We test the performance of L5 for space weather monitoring using STEREO B observations of an Earth‐directed coronal mass ejection (CME), seen as a partial halo by SOHO at L1.
L. Rodriguez +4 more
wiley +1 more source