Solar flares, CMEs and solar energetic particle events during solar cycle 24

2018 ◽  
Vol 61 (2) ◽  
pp. 777-785 ◽  
Author(s):  
Bimal Pande ◽  
Seema Pande ◽  
Ramesh Chandra ◽  
Mahesh Chandra Mathpal
Keyword(s):  
Solar Cycle ◽  
Solar Flares ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals SOLAR SOURCES OF3He-RICH SOLAR ENERGETIC PARTICLE EVENTS IN SOLAR CYCLE 24

2015 ◽  
Vol 806 (2) ◽  
pp. 235 ◽  
Author(s):  
Nariaki V. Nitta ◽  
Glenn M. Mason ◽  
Linghua Wang ◽  
Christina M. S. Cohen ◽  
Mark E. Wiedenbeck
Keyword(s):  
Solar Cycle ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Observations of the longitudinal spread of solar energetic particle events in solar cycle 24

2012 ◽  
Author(s):  
C.M.S. Cohen ◽  
G.M. Mason ◽  
M.E. Wiedenbeck ◽  
D.K. Haggerty ◽  
R. Gomez-Herrero ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
Solar Cycle 24 ◽  
Cycle 24

3He rich periods measured by the Suprathermal Ion Telescope (SIT) on STEREO-A during solar cycle 24

2021 ◽  
Author(s):  
Marlon Köberle ◽  
Radoslav Bucik ◽  
Nina Dresing ◽  
Bernd Heber ◽  
Andreas Klassen ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Heavy Ions ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Detection Algorithm ◽  
Solar Cycle 24 ◽  
Time Periods ◽  
Cycle 24 ◽  
Automatic Detection Algorithm

<p><sup>3</sup>He-rich solar energetic particle (SEP) events are characterized by a peculiar elemental composition with rare species like <sup>3</sup>He or ultra-heavy ions tremendously enhanced over the solar system abundances.<br>We report on <sup>3</sup>He rich SEP periods measured by the Suprathermal Ion Telescope (SIT) onboard STEREO-A beginning in 2007 until 2020, covering the whole solar cycle 24.<br>The mass resolution capabilities of SIT do not allow to easily distinguish between <sup>3</sup>He and <sup>4</sup>He especially in cases of a low <sup>3</sup>He to <sup>4</sup>He ratio.<br>We therefore developed a semi-automatic detection algorithm to find time periods during which a <sup>3</sup>He enhancement can be statistically determined.<br>Using this method we found 112 <sup>3</sup>He rich periods.<br>These periods were further examined in regards of their <sup>3</sup>He/<sup>4</sup>He and Fe/O ratio. <br>Previously about ten <sup>3</sup>He-rich SEP periods measured by SIT on STEREO-A have been reported.<br>An association with in-situ electron measurements by STEREO-SEPT and STEREO-STE showed that ~60% of the 112 periods are accompanied with electron events.<br>The here presented catalogue of <sup>3</sup>He rich periods is intended to serve as a reference for the community.</p>

scholarly journals Shock Connectivity and the Late Cycle 24 Solar Energetic Particle Events in July and September 2017

Space Weather ◽  
2018 ◽  
Vol 16 (5) ◽  
pp. 557-568 ◽  
Author(s):  
J. G. Luhmann ◽  
M. L. Mays ◽  
Yan Li ◽  
C. O. Lee ◽  
H. Bain ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Solar Energetic Particle Events ◽  
Cycle 24

scholarly journals Descriptive study of X-class flares released in the year 2014, during the double peak of SC-24

2015 ◽  
Vol 11 (S320) ◽  
pp. 330-332
Author(s):  
Ahmed A. Hady ◽  
Marwa H. Mostafa ◽  
Susan W. Samwel
Keyword(s):  
Data Analysis ◽  
Solar Cycle ◽  
Solar Flares ◽  
Descriptive Study ◽  
Energetic Particles ◽  
Main Peak ◽  
Solar Cycles ◽  
Double Peak ◽  
Solar Cycle 24 ◽  
Cycle 24

AbstractDuring the declining phase of the Solar cycle 24, a new peak appeared on January 7, 2014. The release of x-class flares, with the high energetic particles, were found to be more intense than that occurred during the main peak of the same cycle. Few X-class flares were released, lately, during the year 2014. We note that during the last 5 solar cycles, a new peak has appeared, releasing high energetic particles and X-class solar flares, which are called the secondary peak or the double peak of solar cycle. The aim of this descriptive study is to follow the morphological and magnetic changes of the active region before, during, and after the production of X-class flares according to data analysis. Furthermore, the causes of the release of such eruptive storms have been discussed for the period, year 2014, during the double peak of the solar cycle 24.

A physics-based method that can predict imminent large solar flares

Science ◽  
2020 ◽  
Vol 369 (6503) ◽  
pp. 587-591 ◽  
Author(s):  
Kanya Kusano ◽  
Tomoya Iju ◽  
Yumi Bamba ◽  
Satoshi Inoue
Keyword(s):  
Solar Cycle ◽  
Solar Flares ◽  
Solar Surface ◽  
Magnetic Polarity ◽  
Empirical Methods ◽  
Polarity Inversion ◽  
Solar Cycle 24 ◽  
Polarity Inversion Line ◽  
Magnetohydrodynamic Instability ◽  
Cycle 24

Solar flares are highly energetic events in the Sun’s corona that affect Earth’s space weather. The mechanism that drives the onset of solar flares is unknown, hampering efforts to forecast them, which mostly rely on empirical methods. We present the κ-scheme, a physics-based model to predict large solar flares through a critical condition of magnetohydrodynamic instability, triggered by magnetic reconnection. Analysis of the largest (X-class) flares from 2008 to 2019 (during solar cycle 24) shows that the κ-scheme predicts most imminent large solar flares, with a small number of exceptions for confined flares. We conclude that magnetic twist flux density, close to a magnetic polarity inversion line on the solar surface, determines when and where solar flares may occur and how large they can be.

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