Results 51 to 60 of about 2,470 (205)

Evidence of Continuous Reconnection along a Helmet Streamer Current Sheet Observed by WISPR on Parker Solar Probe

The Astrophysical Journal
Parker Solar Probe's second solar encounter from 2019 March 30 to April 11 occurred during a period when the corona had a simple magnetic structure and relatively flat heliospheric current sheet (HCS), which was in the field of view of the Wide-field ...
Paulett C. Liewer, Brendan M. Gallagher, Guillermo Stenborg, Mark G. Linton, Jiong Qiu, Angelos Vourlidas, Madison L. Ascione, Marco Velli   +7 more
doaj   +1 more source

The Properties of Small Magnetic Flux Ropes inside the Solar Wind Come from Coronal Holes, Active Regions, and Quiet Sun

The Astrophysical Journal, 2023
The origination and generation mechanisms of small magnetic flux ropes (SMFRs), which are important structures in solar wind, are not clearly known. In the present study, 1993 SMFRs immersed in coronal holes, active regions, and quiet-Sun solar wind are ...
Changhao Zhai, Hui Fu, Jiachen Si, Zhenghua Huang, Lidong Xia   +4 more
doaj   +1 more source

TEMPO at Night: Lightning Flashes and On‐Orbit Instrument Performance

Earth and Space Science, Volume 12, Issue 11, November 2025.
Abstract The abundant nighttime (twilight) spectra from October 2024 are used for characterization of on‐orbit instrument performance of the Tropospheric Emissions: Monitoring of Pollution (TEMPO, a geostationary imaging spectrometer). We select 250 lightning flashes and measure the flash sizes and flash positions in 6 spectral domains spread across ...
Sergey V. Marchenko, James L. Carr, Heesung Chong, John C. Houck, Xiong Liu, David E. Flittner, Joanna Joiner, Brian D. Baker, James K. Lasnik, Dennis K. Nicks   +9 more
wiley   +1 more source

Multispacecraft Observations of 2022 February 8 Prominence Cavity Eruption

The Astrophysical Journal
Helmet streamers are common structures that shape the corona at the largest scales, as observed in eclipse and white-light images. Helmet streamers overlie one cavity embedding a prominence channel and are surrounded by an open field of opposite-polarity
Nishu Karna, Mari Paz Miralles
doaj   +1 more source

The evolution of plasma parameters on a coronal source surface at 2.3 Rs during solar minimum

, 2011
We analyze data from the Solar and Heliospheric Observatory to produce global maps of coronal outflow velocities and densities in the regions where the solar wind is undergoing acceleration.
A. V. Panasyuk, Akinari, Cranmer, Cranmer, Cranmer, Frazin, Gardner, Habbal, J. L. Kohl, Jones, Kohl, L. Strachan, Li, Noci, P. Lamy, Quémerais, Sheeley, SIDC-team, Strachan, Strachan, van de Hulst, Wang, Wang, Woo   +23 more
core   +4 more sources

Inner Magnetospheric and Geomagnetic Responses to Solar Wind Driving During Omega Band Events

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract Omega bands are mesoscale auroral structures that appear as quasi‐periodic eastward drifting protrusions of the poleward edge of the diffuse aurora. Cribb et al. (2024), https://doi.org/10.1029/2024gl109756 demonstrated that the appearance of omega bands is associated with solar wind driving consistent with stream interaction regions. However,
V. Cribb, T. I. Pulkkinen, L. Kepko, B. Gallardo‐Lacourt, N. Partamies, M. Vokhmyanin, S. Apatenkov   +6 more
wiley   +1 more source

The evolution of our understanding of coronal mass ejections

Frontiers in Astronomy and Space Sciences, 2023
The unexpected observation of a sudden expulsion of mass through the solar corona in 1971 opened up a new field of interest in solar and stellar physics.
Russell A. Howard, Angelos Vourlidas, Guillermo Stenborg   +2 more
doaj   +1 more source

Three-dimensional Density Structure of a Solar Coronal Streamer Observed by SOHO/LASCO and STEREO/COR2 in Quadrature [PDF]

The Astrophysical Journal, 2019
Abstract Helmet streamers are a prominent manifestation of magnetic structures with current sheets in the solar corona. These large-scale structures are regions with high plasma density, overlying active regions and filament channels. We investigate the three-dimensional (3D) structure of a coronal streamer, observed simultaneously by ...
Decraemer, Bieke, Zhukov, Andrei N., Van Doorsselaere, Tom   +2 more
openaire   +3 more sources

Statistical Modeling and Prediction of Ionospheric Equivalent Currents Based on SuperMAG Data

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract We present a Solar Wind driven SuperMAG statistical Equivalent Current model (SW‐SMEC), which represents the ionospheric equivalent currents in the Northern Hemisphere. The model is based on average current patterns derived from SuperMAG ground magnetometer data covering the solar cycle 23 (1997–2008).
J. T. Manninen, H. Vanhamäki, A. T. Aikio, J. Gjerloev   +3 more
wiley   +1 more source

Long‐Term Homogeneity of the SSC Series

Space Weather, Volume 23, Issue 10, October 2025.
Abstract Geomagnetic storms produce global variations in the geomagnetic field that are measured at magnetic observatories. Roughly one half of magnetic storms are preceded by sudden increases in the horizontal component of the magnetic field world‐wide.
J. J. Curto, A. Segarra, J. M. Torta, S. Marsal, A. Chambodut, T. Qvick, K. Mursula   +6 more
wiley   +1 more source