Results 21 to 30 of about 638 (150)
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
The Dependence of the Peak Velocity of High-Speed Solar Wind Streams as Measured in the Ecliptic by ACE and the STEREO satellites on the Area and Co-latitude of Their Solar Source Coronal Holes. [PDF]
J Geophys Res Space Phys, 2018 Abstract We study the properties of 115 coronal holes in the time range from August 2010 to March 2017, the peak velocities of the corresponding high‐speed streams as measured in the ecliptic at 1 AU, and the corresponding changes of the Kp index as marker of their geoeffectiveness. We find that the peak velocities of high‐speed streams depend strongly
Hofmeister SJ +5 more
europepmc +2 more sources
Solar Filament Eruptions in H α Doppler Velocity
The Astrophysical Journal, 2023 We use observations taken with a novel solar telescope spectroheliograph to investigate the association between the early filament rise and coronal mass ejections (CMEs).
I. A. Berezin +2 more
doaj +1 more source
Differential rotation for two populations of sunspots
, 2023 Sidereal rotation rates for two populations of sunspot groups: small short-lived groups (SSGs) and large long-lived groups (LLGs) as shown in Figure 7 in Nagovitsyn, Y.
Pevtsov, Alexei +2 more
core +1 more source
Surface flux transport simulations of the photospheric magnetic field [PDF]
, 2019 This thesis studies the long-term evolution of the photospheric magnetic field using surface flux transport simulations. The photospheric magnetic field and magnetic activity are tightly connected to space weather, and affect the whole heliosphere ...
Virtanen, Iiro
core +2 more sources
The reversal of the Sun’s magnetic field in cycle 24
Solar-Terrestrial Physics, 2016 Analysis of synoptic data from the Vector Spectromagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) and the NASA/NSO Spectromagnetograph (SPM) at the NSO/Kitt Peak Vacuum Telescope facility shows that the reversals of ...
Mordvinov A.V. +3 more
doaj +1 more source
The Astrophysical Journal, 2023 We explore the performance of the Alfvén Wave Solar atmosphere Model with near-real-time (NRT) synoptic maps of the photospheric vector magnetic field.
Nishtha Sachdeva +9 more
doaj +1 more source
physica status solidi (a), Volume 217, Issue 24, December 2020., 2020 Photoluminescence spectra is investigated in erbium‐doped GaLaS(O) glass under 808 nm excitation. Herein, the visual impression and green coloration of photoluminescence (PL) are shown. The length of the cylinder is 10 mm and the diameter is close to 3 mm.
Michail M. Voronov +7 more
wiley +1 more source
Long-term studies of photospheric magnetic fields on the Sun
Journal of Space Weather and Space Climate, 2021 We briefly review the history of observations of magnetic fields on the Sun, and describe early magnetograps for full disk measurements. Changes in instruments and detectors, the cohort of observers, the knowledge base etc may result in non-uniformity of
Pevtsov Alexei A. +4 more
doaj +1 more source
Data Assimilative Optimization of WSA Source Surface and Interface Radii using Particle Filtering
Space Weather, Volume 18, Issue 5, May 2020., 2020 Abstract The Wang‐Sheeley‐Arge (WSA) model estimates solar wind speed and interplanetary magnetic field polarity in the inner heliosphere using global photospheric magnetic field maps. WSA employs the Potential Field Source Surface (PFSS) and Schatten Current Sheet (SCS) models to determine the Sun's global coronal magnetic field.
Grant David Meadors +5 more
wiley +1 more source