Results 81 to 90 of about 600 (183)
The Astrophysical JournalThe origin of the slow solar wind is not well understood, unlike the fast solar wind that originates from coronal holes. In situ elemental abundances of the slow solar wind suggest that it originates from initially closed field lines that become open ...
Alexandros Koukras +2 more
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The Astrophysical JournalDuring solar cycle minimum, polar coronal holes show a prominent radio brightening cap. The analysis of polar microwave enhanced radiation in polar coronal holes is helpful for understanding the magnetic field characteristics and the origin of the solar ...
Jing Huang +6 more
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Solar Wind Acceleration in Coronal Holes
, 2002 This paper reviews the current state of our understanding of high-speed solar wind acceleration in coronal holes. Observations by SOHO, coupled with interplanetary particle measurements going back several decades, have put strong constraints on possible explanations for how the protons, electrons, and minor ions receive their extreme kinetic properties.
openaire +2 more sources
Responses of a Coronal Hole to a Fast Flare-driven Coronal Wave
The Astrophysical Journal LettersCoronal waves, significant solar phenomena, act as diagnostic tools for scientists studying solar atmosphere properties. Here, we present a novel observation detailing how a coronal wave event, associated with an X5.0 class flare, influenced the ...
Xiaofan Zhang +14 more
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Source Materials and Heating of Alfvénic Slow and Hot Solar Wind Revealed by Heavy Ions
The Astrophysical JournalThis work quantitatively studies the differences of heavy ions among non-Alfvénic slow wind (N-ASSW), classical fast wind (FSW), and Alfvénic slow and hot wind (ASSW and AHSW) by effect size and Kolmogorov–Smirnov statistic.
Shuyi Meng, Shuo Yao
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Simulation of Thermal Nonequilibrium Cycles in the Solar Wind
The Astrophysical JournalThermal nonequilibrium (TNE) is a condition of the plasma in the solar corona in which the local rate of energy loss due to radiation increases to the point that it cannot be sustained by the various heating terms acting on the plasma, precluding the ...
Roger B. Scott +3 more
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Investigating the Behavior and Spatiotemporal Variations of Green-line Emission in the Solar Corona
The Astrophysical Journal Supplement SeriesUnderstanding coronal structure and dynamics can be facilitated by analyzing green-line emission, which enables the investigation of diverse coronal structures such as coronal loops, streamers, coronal holes, and various eruptions in the solar atmosphere.
Jacob Oloketuyi +8 more
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Solar Coronal Rotation from 1973 to 2017: An Analytical Approach Based on Coronal Hole Areas
The Astrophysical JournalSolar coronal rotation exhibits significant complexity, and its relationship with the 11 yr solar cycle remains poorly understood. Using 597 McIntosh synoptic maps (CR1601–CR2197), we construct the temporal evolution of coronal rotation by performing ...
Zhijun Zhao +5 more
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Predicting the Solar Wind Speed and Interplanetary Sector Structure during Solar Cycles 21–25
The Astrophysical JournalWe use potential-field source-surface (PFSS) extrapolations of photospheric field data to predict the solar wind speed and interplanetary sector structure at Earth during solar cycles 21–25, and compare the results with in situ measurements.
Y.-M. Wang, N. R. Sheeley Jr.
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The Astrophysical Journal LettersThe Parker Solar Probe's discovery that magnetic switchbacks and velocity spikes in the young solar wind are abundant has prompted intensive research into their origin(s) and formation mechanism(s) in the solar atmosphere.
Chuanpeng Hou +30 more
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