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The Solar Ultra-Violet Imaging Telescope (SUIT) Onboard Intelligence for Flare Observations
Tripathi, Durgesh; Tyagi, Anurag; Sankarasubramanian, K. +14 more
Aditya-L1 is India's first observatory-class solar space mission to study the Sun from the Lagrange L1 point. The Solar Ultra-Violet Imaging Telescope (SUIT) is one of the payloads onboard Aditya-L1. SUIT is an off-axis Ritchey-Chrétien (RC) telescope, which images the Sun onto a 4k×4k CCD covering a field-of-view of 1.5 R⊙ w…
Behaviour of 27-Day and 13.5-Day Periodicities in Galactic Cosmic Particles as Observed by Spacecraft and Neutron Monitors During Different Solar Polarity Cycles
Kotzé, Pieter
An analysis has been made of the behaviour of the 27-day and 13.5-day periodicities in proton, C, and O galactic-cosmic-ray (GCR) particles at different energies as observed by the Advanced Composition Explorer (ACE) and SOHO (Solar and Heliospheric Observatory) spacecraft during both Solar Cycles 23 and 24. In addition, the behaviour of the 27-da…
Eruptive Flare, CME, and Shock Wave in the 25 August 2001 High-Energy Solar Event
Grechnev, V. V.; Kochanov, A. A.; Uralov, A. M.
The major SOL2001-08-25 event produced a fast coronal mass ejection (CME: 1430 km s−1), strong flare emissions in hard X-rays and γ -rays extending to high energies, and neutrons detected both on spacecraft and by a low-latitude neutron monitor. To supplement the probable picture of this outstanding event, we reconstruct kinematic plots…
A Machine Learning Enhanced Approach for Automated Sunquake Detection in Acoustic Emission Maps
Besliu-Ionescu, Diana; Mercea, Vanessa; Paraschiv, Alin Razvan +2 more
Sunquakes are seismic emissions visible on the solar surface, associated with some solar flares. Although discovered in 1998, they have only recently become a more commonly detected phenomenon. Despite the availability of several manual detection guidelines, to our knowledge, the astrophysical data produced for sunquakes is new to the field of mac…
Small-Scale Upflows in a Coronal Hole - Tracked from the Photosphere to the Corona
Barczynski, Krzysztof; Orozco Suárez, David; Mandrini, Cristina H. +4 more
Coronal transients are known as sources of coronal upflows. With the commissioning of Solar Orbiter, it became apparent that coronal small-scale features are even more frequent than previously estimated. It was found that even small coronal features seen by Solar Orbiter can produce visible upflows. Therefore, it is important to study the plasma f…
Three Eruptions Observed by Remote Sensing Instruments Onboard Solar Orbiter
Susino, Roberto; Romoli, Marco; Andretta, Vincenzo +31 more
On February 21 and March 21 - 22, 2021, the Extreme Ultraviolet Imager (EUI) onboard Solar Orbiter observed three prominence eruptions. The eruptions were associated with coronal mass ejections (CMEs) observed by Metis, Solar Orbiter's coronagraph. All three eruptions were also observed by instruments onboard the Solar-TErrestrial RElations Observ…
Accelerating Multiframe Blind Deconvolution via Deep Learning
Asensio Ramos, Andrés; Kuckein, Christoph; Esteban Pozuelo, Sara
Ground-based solar-image restoration is a computationally expensive procedure that involves nonlinear optimization techniques. The presence of atmospheric turbulence produces perturbations in individual images that make it necessary to apply blind deconvolution techniques. These techniques rely on the observation of many short-exposure frames that…
Study of Forbush Decrease Recovery Times by the Payload for Antimatter Matter Exploration and Light-Nuclei Astrophysics (PAMELA) Experiment
Ricci, M.; Picozza, P.; Bazilevskaya, G. A. +37 more
A Forbush decrease (FD) is a sudden drop of cosmic-ray intensity arising as an effect of coronal mass ejection (CME) propagation in interplanetary space. The different physical properties of each CME cause variability in the FDs observed by scientific instruments. A comprehensive study of both phenomena is required to properly understand the proce…
Temporal and Latitudinal Variation in Penumbra-Umbra Ratios of the Sunspots: Analyses of RGO, Kodaikanal and Debrecen Databases
Takalo, Jouni
We study the latitudinal distribution and temporal evolution of the sunspot penumbra-umbra ratio (q ) for the even and odd Solar Cycles 12 - 24 of RGO sunspot groups, SC21 - SC24 of Debrecen sunspot groups and Kodaikanal sunspot dataset for SC16 - SC24. We find that RGO even (odd) Cycles have q -values 5.20 (4.75), Kodaikanal even (odd) cycles hav…
Study of Global Photospheric and Chromospheric Flows Using Local Correlation Tracking and Machine Learning Methods I: Methodology and Uncertainty Estimates
Xu, Yan; Denker, Carsten; Wang, Haimin +3 more
Cyclical variations of the solar magnetic fields, and hence the level of solar activity, are among the top interests of space weather research. Surface flows in global-scale, in particular differential rotation and meridional flows, play important roles in the solar dynamo that describes the origin and variation of solar magnetic fields. In princi…