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Solar energetic particles (SEPs) are an essential source of space radiation, which are hazards for humans in space, spacecraft, and technology in general. In this paper we propose a deep learning method, specifically a bidirectional long…

Solar and Stellar Astrophysics · Physics 2022-05-18 Yasser Abduallah , Vania K. Jordanova , Hao Liu , Qin Li , Jason T. L. Wang , Haimin Wang

Solar energetic particles (SEPs), including protons and heavy ions, are believed to be accelerated either by CME shock or by magnetic reconnection. The latter also produces solar flares, in which the white light flares (WLFs) are among the…

Solar and Stellar Astrophysics · Physics 2018-01-16 Nengyi Huang , Yan Xu , Haimin Wang

Solar Energetic Particles (SEPs) and radio bursts are indicators of particle acceleration on the Sun and in the heliosphere. The accelerated particles have energies significantly higher than thermal particles up to several orders of…

Solar and Stellar Astrophysics · Physics 2024-10-14 Nat Gopalswamy

Abundances of elements comprising solar energetic particles (SEPs) come with two very different patterns. Historically called "impulsive" and "gradual" events, they have been studied for 40 years, 20 years by the Wind spacecraft. Gradual…

Solar and Stellar Astrophysics · Physics 2015-01-06 Donald V. Reames

Forecasting large Solar Energetic Particle (SEP) events associated with shocks driven by fast coronal mass ejections (CME) pose a major difficulty in the field of Space Weather. Besides issues associated with CME initiation, the SEP…

Solar and Stellar Astrophysics · Physics 2019-08-19 J. Martin Laming , J. Dan Moses , Yuan-Kuen Ko , Chee K. Ng , Cara E. Rakowski , Allan J. Tylka

Sixty years ago the first observation was published showing solar energetic particles (SEPs) with a sampling of chemical elements. Thus began study of the direct products of dynamic physics in the solar corona. As we have progressed from…

Solar and Stellar Astrophysics · Physics 2021-08-19 Donald V. Reames

Metric type II solar radio bursts and solar energetic particles (SEPs) are both associated with shock fronts driven by coronal mass ejections (CMEs) in the solar corona. Recent studies of ground level enhancements (GLEs), regular large…

We study the abundances of the elements He through Pb in Fe-rich impulsive solar energetic-particle (SEP) events with measurable abundances of ions with atomic number Z>2 observed on the Wind spacecraft, and their relationship with coronal…

Solar and Stellar Astrophysics · Physics 2015-01-06 Donald V. Reames , Edward W. Cliver , Stephen W. Kahler

The Probabilistic Solar Particle Event foRecasting (PROSPER) model predicts the probability of occurrence and the expected peak flux of Solar Energetic Particle (SEP) events. Predictions are derived for a set of integral proton energies…

We report on the first comprehensive study of the coronal mass ejections (CMEs) associated with $\sim$25 MeV solar energetic proton (SEP) events in 1980-2013 observed in the low/inner corona by the Mauna Loa Solar Observatory (MLSO) Mk3 and…

Solar and Stellar Astrophysics · Physics 2023-08-28 I. G. Richardson , O. C. St Cyr , J. T. Burkepile , H. Xie , B. J. Thompson

We use multiwavelength data from space and ground based instruments to study the solar flares and coronal mass ejections (CMEs) on January 23, 2012 that were responsible for one of the largest solar energetic particle (SEP) events of solar…

We present a new empirical model to predict solar energetic particle (SEP) event-integrated and peak intensity spectra between 10 and 130 MeV at 1 AU, based on multi-point spacecraft measurements from the Solar TErrestrial RElations…

Solar and Stellar Astrophysics · Physics 2021-02-24 Alessandro Bruno , Ian G. Richardson

The forecasting of solar energetic particles (SEPs) is a prominent area of space weather research. Numerous forecasting models exist that predict SEP event properties at proton energies <100MeV. One of these models is the SPARX system, a…

Solar and Stellar Astrophysics · Physics 2023-07-12 Charlotte O. G. Waterfall , Silvia Dalla , Mike S. Marsh , Timo Laitinen , Adam Hutchinson

One of the sources of solar energetic particle (SEP) events is shocks that are driven by fast coronal mass ejections (CMEs). They can accelerate SEPs up to relativistic energies and are attributed to the largest SEP events. New studies…

Solar and Stellar Astrophysics · Physics 2023-06-21 N. Talebpour Sheshvan , N. Dresing , R. Vainio , A. Afanasiev , D. E. Morosan

We report on further evidence that solar energetic particles are organized by the kinematic properties of coronal mass ejections (CMEs)[1]. In particular, we focus on the starting frequency of type II bursts, which is related to the…

Solar and Stellar Astrophysics · Physics 2017-10-11 N Gopalswamy , P Mäkelä , S Yashiro , N Thakur , S Akiyama , H Xie

Intense solar energetic particle (SEP) events data, associated with ground level enhancements (GLEs), occurred during 1989 to 2006 have been obtained from the spectrometers on board GOES spacecraft in the energy range 10-100 MeV. The…

Solar and Stellar Astrophysics · Physics 2017-08-02 P. K. Manoharan , G. Agalya

We compare estimates of the speed and width of coronal mass ejections (CMEs) in several catalogs for the CMEs associated with ~200 solar energetic particle (SEP) events in 2006-2013 that included 25 MeV protons. The catalogs used are: CDAW,…

Solar and Stellar Astrophysics · Physics 2016-04-13 Ian G. Richardson , Tycho T. von Rosenvinge , Hilary V. Cane

Major solar eruptive events (SEEs), consisting of both a large flare and a near simultaneous large fast coronal mass ejection (CME), are the most powerful explosions and also the most powerful and energetic particle accelerators in the…

We study the solar energetic particle (SEP) event observed on 9 October 2021, by multiple spacecraft including Solar Orbiter (SolO). The event was associated with an M1.6 flare, a coronal mass ejection (CME) and a shock wave. During the…

Solar Energetic Particles (SEPs) form a critical component of Space Weather. The complex, intertwined dynamics of SEP sources, acceleration, and transport make their forecasting very challenging. Yet, information about SEP arrival and their…

Solar and Stellar Astrophysics · Physics 2024-11-26 Maher A. Dayeh , Subhamoy Chatterjee , Andres Munoz-Jaramillo , Kimberly Moreland , Hazel M. Bain , Samuel Hart