scholarly journals Relationship of Soft X–Ray caused from Solar Flares and Solar Energetic Particles at Maximum of Solar cycle 24

2019 ◽  
pp. 175-178
Keyword(s):  
Solar Cycle ◽  
Solar Flares ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
X Ray ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Relationship Of

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.

Characteristics of Sunquake Events Observed in Solar Cycle 24

2021 ◽  
Author(s):  
Alexander Kosovichev ◽  
Ivan Sharykin
Keyword(s):  
Solar Cycle ◽  
Solar Flares ◽  
Active Regions ◽  
Impulsive Phase ◽  
High Energy ◽  
Lower Atmosphere ◽  
Solar Dynamics Observatory ◽  
X Ray ◽  
Solar Cycle 24 ◽  
Cycle 24

<p>Helioseismic response to solar flares ("sunquakes") occurs due to localized force or/and momentum impacts observed during the flare impulsive phase in the lower atmosphere. Such impacts may be caused by precipitation of high-energy particles, downward shocks, or magnetic Lorentz force. Understanding the mechanism of sunquakes is a key problem of the flare energy release and transport. Our statistical analysis of M-X class flares observed by the Solar Dynamics Observatory during Solar Cycle 24 has shown that contrary to expectations, many relatively weak M-class flares produced strong sunquakes, while for some powerful X-class flares, helioseismic waves were not observed or were weak. The analysis also revealed that there were active regions characterized by the most efficient generation of sunquakes during the solar cycle. We found that the sunquake power correlates with maximal values of the X-ray flux derivative better than with the X-ray class. The sunquake data challenge the current theories of solar flares.</p>

X-Ray Flares and Activity Complexes on the Sun in Solar Cycle 24

2020 ◽  
Vol 64 (1) ◽  
pp. 58-65 ◽  
Author(s):  
E. S. Isaeva ◽  
V. M. Tomozov ◽  
S. A. Yazev
Keyword(s):  
Solar Cycle ◽  
The Sun ◽  
X Ray ◽  
Solar Cycle 24 ◽  
Cycle 24

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 cycle 24: Implications for energetic particles and long-term space climate change

2011 ◽  
Vol 38 (19) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. J. Owens ◽  
M. Lockwood ◽  
L. Barnard ◽  
C. J. Davis
Keyword(s):  
Climate Change ◽  
Solar Cycle ◽  
Energetic Particles ◽  
Solar Cycle 24 ◽  
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.

Study of Asymmetric Behavior of Soft X-Ray Flares During Solar Cycle 24

2020 ◽  
Author(s):  
Amrita Prasad ◽  
Soumya Roy ◽  
Subhash Chandra Panja ◽  
Sankar Narayan Patra
Keyword(s):  
Solar Cycle ◽  
X Ray ◽  
Asymmetric Behavior ◽  
Solar Cycle 24 ◽  
Cycle 24
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