Results 11 to 20 of about 6,269,186 (288)
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
doaj +3 more sources
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
Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling [PDF]
, 2008 In this study we show how hydrogen and helium lines modelling can be used to make a diagnostic of active and eruptive prominences. One motivation for this work is to identify the physical conditions during prominence activation and eruption. Hydrogen and
Labrosse, N. +2 more
core +10 more sources
SIMULATION OF THE FORMATION OF A SOLAR ACTIVE REGION [PDF]
The Astrophysical Journal, 2010 Accepted for publication in ...
Cheung, M. +3 more
openaire +3 more sources
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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 +2 more
doaj +1 more source
DISTRIBUTION OF ELECTRIC CURRENTS IN SOLAR ACTIVE REGIONS [PDF]
The Astrophysical Journal, 2014 6 pages, 5 figures, to appear in Astrophysical Journal ...
Török, T. +8 more
openaire +5 more sources