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Open-field Coronal Structures Neighbouring the Sunspot of AR 8535
Vrublevskis, A.; Ryabov, B. I.
We make use of the Potential Field Source Surface (PFSS) model and reveal new details in the strong fields of the dominant sunspot of the active region (AR) 8535. Due to its importance in determining the field line connectivity and topology with resulting consequences for both plasma confinement and dynamics we construct the global magnetic fields…
EUV Wave Detection and Characterization Using Deep Learning
Liu, Sixuan; Xu, Long; Yan, Yihua +1 more
Coronal Mass Ejections (CMEs) are the most violent solar bursts. They cause severe disturbances in the solar-terrestrial space and affect human activities in many aspects, especially causing damage to high-tech infrastructure. It usually takes few hours for a CME to arrive at the Earth after eruption. Therefore, many efforts have been devoted to C…
Editorial: Solar Wind at the Dawn of the Parker Solar Probe and Solar Orbiter Era
Lapenta, Giovanni; van Driel-Gesztelyi, Lidia; Zhukov, Andrei
Solar Wind 15 brought together almost 250 experts from all continents of the world to discuss the current trends and future perspectives of the research on the Sun and its solar wind. The present article collection recaptures some of the highlights of their contributions.
New Types of the Chromospheric Anemone Microflares: Case Study
Dumin, Yurii V.; Somov, Boris V.
Chromospheric anemone microflares (AMFs) are transient solar phenomena whose emission regions have a multi-ribbon configuration. As distinct from the so-called "atypical" solar flares, also possessing a few ribbons, the temporal and spatial scales of AMFs are a few times less, and the configuration of their ribbons is more specific (star-like). Th…
Comparative Study of a Sunspot at Two Different Instances of Time
Hamedivafa, Hashem
We investigate the evolutionary effects on the brightness of a sunspot as well as on the properties of its fine-structures using two sets of time series of G-band images of a single sunspot in NOAA 10944 recorded at two symmetric locations on the solar disc by Hinode/SOT (Solar Optical Telescope). The second time series (phase W) was recorded 2.5 …
Multiwavelength Analysis of the Kinematics of a Long Duration Flare-CME Event on 27 January 2012
Shanmugaraju, A.; Suresh, K.; Selvarani, G. +1 more
We present a detailed analysis of a long-duration flare associated with a coronal mass ejection (CME) event that occurred on 27 January 2012 in the active region (AR) 11402. We analyze the kinematics of the CME and the close relationship between the flare, radio burst, and CME. We used STEREO (Solar Terrestrial Relations Observatory)/EUVI A (Extre…
The High-Resolution Coronal Imager, Flight 2.1
Tiwari, Sanjiv K.; Golub, Leon; Winebarger, Amy R. +49 more
The third flight of the High-Resolution Coronal Imager (Hi-C 2.1) occurred on May 29, 2018; the Sounding Rocket was launched from White Sands Missile Range in New Mexico. The instrument has been modified from its original configuration (Hi-C 1) to observe the solar corona in a passband that peaks near 172 Å, and uses a new, custom-built low-noise …
CME-HSS Interaction and Characteristics Tracked from Sun to Earth
Veronig, Astrid M.; Dumbović, Mateja; Temmer, Manuela +9 more
In a thorough study, we investigate the origin of a remarkable plasma and magnetic field configuration observed in situ on June 22, 2011, near L1, which appears to be a magnetic ejecta (ME) and a shock signature engulfed by a solar wind high-speed stream (HSS). We identify the signatures as an Earth-directed coronal mass ejection (CME), associated…
What the Sudden Death of Solar Cycles Can Tell Us About the Nature of the Solar Interior
Rempel, Matthias; McIntosh, Scott W.; Leamon, Robert J. +3 more
We observe the abrupt end of solar-activity cycles at the Sun's Equator by combining almost 140 years of observations from ground and space. These "terminator" events appear to be very closely related to the onset of magnetic activity belonging to the next solar cycle at mid-latitudes and the polar-reversal process at high latitudes. Using multi-s…
Fast Solar Image Classification Using Deep Learning and Its Importance for Automation in Solar Physics
Fletcher, Lyndsay; Armstrong, John A.
The volume of data being collected in solar physics has exponentially increased over the past decade and with the introduction of the Daniel K. Inouye Solar Telescope (DKIST) we will be entering the age of petabyte solar data. Automated feature detection will be an invaluable tool for post-processing of solar images to create catalogues of data re…