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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 +3 more
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Flows around Averaged Solar Active Regions. [PDF]
Astrophys J, 2019 Abstract We explore the general properties of near-surface flows around solar active regions. Helioseismic holography is applied to HMI Dopplergrams yielding nearly 5000 flow measurements of 336 unique active regions observed by the Solar Dynamics Observatory between 2010 and 2014.
Braun DC.
europepmc +5 more sources
The Effect of “Rogue” Active Regions on the Solar Cycle [PDF]
Solar Physics, 2017 The origin of cycle-to-cycle variations in solar activity is currently the focus of much interest. It has recently been pointed out that large individual active regions with atypical properties can have a significant impact on the long term behaviour of solar activity.
Melinda Nagy +2 more
exaly +3 more sources
Dynamics of solar active regions [PDF]
Astronomy & Astrophysics, 2003 I present results of an international joint observing campaign, which was carried out in September 1999 and 2000, to study the oscillatory behaviour of active regions (ARs). In this contribution I will concentrate on oscillations in the higher layers of the solar atmosphere as observed with the UV filters of the Transition Region and Coronal Explorer ...
K. Muglach
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Dynamics of solar active regions [PDF]
Astronomy & Astrophysics, 2005 We present new results of an international joint observing campaign, which was carried out in September 2000 to study the oscillatory behaviour of solar active regions. We concentrate on oscillations in the lower layers of the solar atmosphere as observed with the Michelson Doppler Imager (MDI, Scherrer et al. 1995, Sol. Phys., 162, 129). The resulting
K. Muglach, A. Hofmann, J. Staude
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GLOBAL DYNAMICS OF SUBSURFACE SOLAR ACTIVE REGIONS [PDF]
The Astrophysical Journal, 2012 23 pages (ApJ 2-column format), 19 figures, accepted for publication in ...
Jouve, L., Brun, A.S., Aulanier, G.
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SIMULATION OF THE FORMATION OF A SOLAR ACTIVE REGION [PDF]
The Astrophysical Journal, 2010 Accepted for publication in ...
Cheung, M. +3 more
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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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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 +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 +3 more
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