Results 1 to 10 of about 34,558 (218)

What Are the Causes of Super Activity of Solar Active Regions?

The Astrophysical Journal, 2023
Flare productivity varies among solar active regions (ARs). This study analyzed 20 ARs of contrasting sunspot areas and flare productivities to understand the super flare productivity of certain ARs.
Suman K. Dhakal, Jie Zhang
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Intriguing Plasma Composition Pattern in a Solar Active Region: A Result of Nonresonant Alfvén Waves?

The Astrophysical Journal, 2023
The plasma composition of the solar corona is different from that of the solar photosphere. Elements that have a low first ionization potential (FIP) are preferentially transported to the corona and therefore show enhanced abundances in the corona ...
Teodora Mihailescu, David H. Brooks, J. Martin Laming, Deborah Baker, Lucie M. Green, Alexander W. James, David M. Long, Lidia van Driel-Gesztelyi, Marco Stangalini   +8 more
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Deep Learning–based Solar Flare Forecasting Model. III. Extracting Precursors from EUV Images

The Astrophysical Journal Supplement Series, 2023
A solar flare is one of the most intense solar activities, and flare forecasting is necessary to avoid its destructive impact on the near-Earth space environment and technological infrastructure.
Dezhi Sun, Xin Huang, Zhongrui Zhao, Long Xu   +3 more
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Properties of Flare-imminent versus Flare-quiet Active Regions from the Chromosphere through the Corona. I. Introduction of the AIA Active Region Patches (AARPs)

The Astrophysical Journal, 2023
We begin here a series of papers examining the chromospheric and coronal properties of solar active regions. This first paper describes an extensive data set of images from the Atmospheric Imaging Assembly on the Solar Dynamics Observatory curated for ...
Karin Dissauer, K. D. Leka, Eric L. Wagner   +2 more
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Spectro-polarimetric Properties of Sunquake Sources in X1.5 Flare and Evidence for Electron and Proton Beam Impacts

The Astrophysical Journal, 2023
The first significant sunquake event of Solar Cycle 25 was observed during the X1.5 flare of 2022 May 10, by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory.
Alexander G. Kosovichev, Viacheslav M. Sadykov, John T. Stefan   +2 more
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High-resolution Observations of the Low Atmospheric Response to Small Coronal Heating Events in an Active Region Core

The Astrophysical Journal, 2023
High-resolution spectral observations of the lower solar atmosphere (chromosphere and transition region) during coronal heating events, in combination with predictions from models of impulsively heated loops, provide powerful diagnostics of the ...
Paola Testa, Helle Bakke, Luc Rouppe van der Voort, Bart De Pontieu   +3 more
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A Strong-flare Prediction Model Developed Using a Machine-learning Algorithm Based on the Video Data Sets of the Solar Magnetic Field of Active Regions

The Astrophysical Journal Supplement Series, 2023
It is well accepted that the physical properties obtained from the solar magnetic field observations of active regions (ARs) are related to solar eruptions.
Jingjing Wang, Bingxian Luo, Siqing Liu, Yue Zhang   +3 more
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Information Horizon of Solar Active Regions

The Astrophysical Journal Letters, 2023
Information theory is used to characterize the solar active region periodicities and memories from the Carrington map images 1974–2021. The active regions typically evolve and move from one map to the next.
Jay R. Johnson, Simon Wing, Carson O’ffill, Bishwa Neupane   +3 more
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Sympathetic Partial Filament Eruptions Caused by the Interaction between Two Nearby Filaments

The Astrophysical Journal, 2023
To better understand the physical connections in sympathetic solar eruptions, we investigated the interaction between two nearby filaments and their successive partial eruptions in the active region (AR) NOAA 12866 on 2021 September 9 by using data from ...
Liping Yang, Xiaoli Yan, Zhike Xue, Jincheng Wang, Liheng Yang, Qiaoling Li, Zhe Xu, Yang Peng, Xia Sun, Xinsheng Zhang   +9 more
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The Formation of a U-shaped Filament Due to the Successive Magnetic Reconnection between a Filament and Its Nearby Chromospheric Fibrils

The Astrophysical Journal, 2023
Although magnetic reconnection plays a key role in the formation of a solar filament, the detailed formation process is still ambiguous. Combining the observational data from the New Vacuum Solar Telescope and the Solar Dynamics Observatory, we analyzed ...
Liping Yang, Xiaoli Yan, Zhike Xue, Jincheng Wang, Liheng Yang, Zhe Xu, Qiaoling Li, Yian Zhou, Yang Peng, Xinsheng Zhang   +9 more
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