Results 51 to 60 of about 10,729 (219)

Post‐Processing Probabilistic Forecasts of the Solar Wind by Data Mining Similar Scenarios

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The solar wind speed at Earth is one of the most important parameters regarding the effects of space weather on society. Thus far, most approaches for predicting the solar wind speed produce a single‐value time series without uncertainty, or utilize ensemble methods which require custom calibration development.
Daniel E. da Silva, Yash Parlikar, Shaela I. Jones, Charles N. Arge   +3 more
wiley   +1 more source

A Community Data Set for Comparing Automated Coronal Hole Detection Schemes

The Astrophysical Journal Supplement Series
Automated detection schemes are nowadays the standard approach for locating coronal holes in extreme-UV images from the Solar Dynamics Observatory (SDO). However, factors such as the noisy nature of solar imagery, instrumental effects, and others make it
Martin A. Reiss, Karin Muglach, Emily Mason, Emma E. Davies, Shibaji Chakraborty, Veronique Delouille, Cooper Downs, Tadhg M. Garton, Jeremy A. Grajeda, Amr Hamada, Stephan G. Heinemann, Stefan Hofmeister, Egor Illarionov, Robert Jarolim, Larisza Krista, Chris Lowder, Erwin Verwichte, Charles N. Arge, Laura E. Boucheron, Claire Foullon, Michael S. Kirk, Alexander Kosovichev, Andrew Leisner, Christian Möstl, James Turtle, Astrid Veronig   +25 more
doaj   +1 more source

Relationship of Coronal Mass Ejection Events with Solar Flares and coronal Holes [PDF]

Symposium - International Astronomical Union, 1990
We present an analysis of the relationship between coronal mass ejection (CME) events with solar flares and coronal holes. Out of 79 CME events whose location and span are known, 10 CME event circles contain solar flares. On the other hand out of 71 CME events (selected for the study with coronal holes) 40 CME event circles contain coronal holes.
openaire   +1 more source

Solar Polar Flux Redistribution Based on Observed Coronal Holes

The Astrophysical Journal, 2022
Abstract We explore the use of observed polar coronal holes (CHs) to constrain the flux distribution within the polar regions of global solar magnetic field maps in the absence of reliable quality polar field observations. Global magnetic maps, generated by the Air Force Data Assimilative Photospheric flux Transport (ADAPT) model, are ...
Samuel J. Schonfeld, Carl J. Henney, Shaela I. Jones, Charles N. Arge   +3 more
openaire   +2 more sources

A New Phase for Space Weather

Space Weather, Volume 24, Issue 4, April 2026.
Abstract As we move into the declining phase of solar cycle 25, the sunspot number is going down but space weather impacts are not disappearing. Solar energetic particle events, large x‐ray flares, and geomagnetic storms are still happening and the declining phase will bring a different balance of hazards.
Steven K. Morley
wiley   +1 more source

Thermodynamic Evolution of Plumes

The Astrophysical Journal
Plumes are considered to play an important role in the origin of the solar wind. However, an understanding of their thermodynamic evolution is not complete. Here, we perform a detailed study of a plume inside a coronal hole throughout its lifetime, using
Biswanath Malaker, Vishal Upendran, Durgesh Tripathi   +2 more
doaj   +1 more source

The Nature of Solar Polar Rays [PDF]

, 2000
We use time series observations from the SOHO and Yohkoh spacecraft to study solar polar rays. Contrary to our expectations, we find that the rays are associated with active regions on the sun and are not features of the polar coronal holes.
Barry LaBonte, David Jewitt, Inhester B., Jing Li   +3 more
core   +2 more sources

Impact of Solar Irradiance on Storm‐Time Thermospheric Mass Density Response

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract As a key parameter in the externally forced ionosphere–thermosphere (IT) system, mass density response to storms is affected by the prevailing solar irradiance. To better understand this relationship, we examine mass density responses to the same storm but with different background solar irradiance levels.
Simin Zhang, Liying Qian, Nicholas Pedatella, Eric Sutton, Noah Peterson, Thomas Berger   +5 more
wiley   +1 more source

Estimating the Poynting Flux of Alfvénic Waves in Polar Coronal Holes across Solar Cycle 24

The Astrophysical Journal
Alfvénic waves are known to be prevalent throughout the corona and solar wind. Determining the Poynting flux supplied by the waves is required for constraining their role in plasma heating and acceleration, as well as providing a constraint for Alfvén ...
R. J. Morton, M. J. Weberg, N. Balodhi, J. A. McLaughlin   +3 more
doaj   +1 more source

Solar origins of solar wind properties during the cycle 23 solar minimum and rising phase of cycle 24

Journal of Advanced Research, 2013
The solar wind was originally envisioned using a simple dipolar corona/polar coronal hole sources picture, but modern observations and models, together with the recent unusual solar cycle minimum, have demonstrated the limitations of this picture.
Janet G. Luhmann, Gordon Petrie, Pete Riley   +2 more
doaj   +1 more source