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In this work we leverage a weakly-labeled dataset of spectral data from NASAs IRIS satellite for the prediction of solar flares using the Multiple Instance Learning (MIL) paradigm. While standard supervised learning models expect a label…

Solar and Stellar Astrophysics · Physics 2022-11-21 Cédric Huwyler , Martin Melchior

We study the upward propagation of a localized velocity pulse that is initially launched below the transition region within the solar atmosphere. The pulse quickly steepens into a shock, which may lead to the formation of spicules. We solve…

Solar and Stellar Astrophysics · Physics 2015-05-19 K. Murawski , T. V. Zaqarashvili

The solar corona is extremely dynamic. Every leap in observational capabilities has been accompanied by unexpected revelations of complex dynamic processes. The ever more sensitive instruments now allow us to probe events with increasingly…

Solar and Stellar Astrophysics · Physics 2023-06-28 Shabbir Bawaji , Ujjaini Alam , Surajit Mondal , Divya Oberoi , Ayan Biswas

Spicules are the thin hair/grass-like structures that are prominently observed at the chromospheric solar limb. It is believed that fibrils and rapid blueshifted and redshifted excursions (RBEs and RREs; collectively referred to as REs)…

Solar and Stellar Astrophysics · Physics 2024-08-09 Ravi Chaurasiya , Ankala Raja Bayanna , R. E. Louis , T. M. D. Pereira , S. K. Mathew

Rapid Blue- and Red-shifted Excursions (RBEs and RREs) are likely to be the on-disk counterparts of Type II spicules. Recently, heating signatures from RBEs/RREs have been detected in IRIS slit-jaw images dominated by transition-region…

Solar and Stellar Astrophysics · Physics 2016-04-13 V. M. J. Henriques , D. Kuridze , M. Mathioudakis , F. P. Keenan

Spicules are the most ubuiquitous type of jets in the solar atmosphere. The advent of high-resolution imaging and spectroscopy from the Interface Region Imaging Spectrograph (IRIS) and ground-based observatories has revealed the presence of…

Solar and Stellar Astrophysics · Physics 2017-11-01 Bart De Pontieu , Juan Martinez-Sykora , Georgios Chintzoglou

We present new results from first observations of the quiet solar photosphere performed through the Interferometric BIdimensional Spectrometer (IBIS) in spectropolarimetric mode. IBIS allowed us to measure the four Stokes parameters in the…

Solar and Stellar Astrophysics · Physics 2015-05-19 B. Viticchié , D. Del Moro , S. Criscuoli , F. Berrilli

The Integrated Science Investigations of the Sun (IS$\odot$IS) instrument suite includes two Energetic Particle instruments: EPI-Hi, designed to measure ions from ~1-200 MeV/nuc, and EPI-Lo, designed to measure ions from ~20 keV/nuc to ~15…

Spicules are elongated, jet-like structures that populate the solar chromosphere and are rooted in the photosphere. In recent years, high-resolution observations and advanced numerical simulations have provided insights into their…

Multi-line spectropolarimetric observations allow for the simultaneous inference of the magnetic field at different layers of the solar atmosphere and provide insight into how these layers are magnetically coupled. The new upgrade of the…

We use high-resolution observations of the Sun in Ca II H 3968 A from the Solar Optical Telescope on Hinode to show that there are at least two types of spicules that dominate the structure of the magnetic solar chromosphere. Both types are…

A rich spectrum of molecular hydrogen (H$_2$) emission lines is seen in sensitive observations from the far ultraviolet (FUV) channels of the Interface Region Imaging Spectrograph (IRIS) during flare activity in solar active region NOAA…

Solar and Stellar Astrophysics · Physics 2024-10-08 Sarah A. Jaeggli , Adrian N. Daw

Spicules are long, thin, highly dynamic features that jut out ubiquitously from the solar limb. They dominate the interface between the chromosphere and corona and may provide significant mass and energy to the corona. We use high-quality…

Solar and Stellar Astrophysics · Physics 2015-06-05 B. De Pontieu , M. Carlsson , L. H. M. Rouppe van der Voort , R. J. Rutten , V. H. Hansteen , H. Watanabe

Macrospicules are relatively large spicule-like formations found mainly over the polar coronal holes when observing in the transition region spectral lines. In this study, we took advantage of the two short series of observations in the He…

Solar and Stellar Astrophysics · Physics 2017-01-04 I. P. Loboda , S. A. Bogachev

Determining the magnetic field of solar spicules is vital for developing adequate models of these plasma jets, which are thought to play a key role in the thermal, dynamic, and magnetic structure of the chromosphere. Here we report on…

Solar and Stellar Astrophysics · Physics 2015-05-13 R. Centeno , J. Trujillo Bueno , A. Asensio Ramos

The goal is to compare the intricate details of the magnetic and flow fields around two solar pores, where one is part of an active region and the other is an isolated pore, with a secondary goal of demonstrating the scientific capabilities…

Solar and Stellar Astrophysics · Physics 2024-10-02 Meetu Verma

We report observations of solar spicules at millimeter wavelengths (mm-$\lambda$) using the Atacama Large Millimeter/submillimeter Array (ALMA). These are supplemented by observations in optical (O), ultraviolet (UV) and extreme ultraviolet…

Solar and Stellar Astrophysics · Physics 2025-04-09 T. S. Bastian , C. Alissandrakis , A. Nindos , M. Shimojo , S. M. White

Solar limb and disc spicule quasi- periodic motions have been reported for a long time, strongly suggesting that they are oscillating. In order to clear up the origin and possibly explain some solar limb and disc spicule quasi-periodic…

Solar and Stellar Astrophysics · Physics 2015-05-27 E. Tavabi , S. Koutchmy , A. Ajabshirizadeh

Macrospicules (MS) are localised small-scale jet-like phenomena in the solar atmosphere, which have the potential to transport considerable amount of momentum and energy from the lower solar atmospheric regions to the Transition Region and…

Solar and Stellar Astrophysics · Physics 2017-02-01 T. S. Kiss , N. Gyenge , R. Erdelyi

We succeeded in observing two large spicules simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA), the Interface Region Imaging Spectrograph (IRIS), and the Atmospheric Imaging Assembly (AIA) onboard the Solar…