scholarly journals What is Causing the Deficit of High-Energy Solar Particles in Solar Cycle 24?

2017 ◽  
Author(s):  
Richard Mewaldt ◽  
Gang Li ◽  
Junxiang Hu ◽  
Christina Cohen
Keyword(s):  
Solar Cycle ◽  
High Energy ◽  
Solar Cycle 24 ◽  
Solar Particles ◽  
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>

scholarly journals Performance of the SciBar cosmic ray telescope (SciCRT) toward the detection of high-energy solar neutrons in solar cycle 24

2014 ◽  
Vol 66 (1) ◽  
pp. 130 ◽  
Author(s):  
Yoshinori Sasai ◽  
Yuya Nagai ◽  
Yoshitaka Itow ◽  
Yutaka Matsubara ◽  
Takashi Sako ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Cosmic Ray ◽  
High Energy ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Why is solar cycle 24 an inefficient producer of high-energy particle events?

2017 ◽  
Vol 604 ◽  
pp. A47 ◽  
Author(s):  
Rami Vainio ◽  
Osku Raukunen ◽  
Allan J. Tylka ◽  
William F. Dietrich ◽  
Alexandr Afanasiev
Keyword(s):  
Solar Cycle ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Major solar eruptions and high-energy particle events during solar cycle 24

2014 ◽  
Vol 66 (1) ◽  
Author(s):  
Nat Gopalswamy ◽  
Hong Xie ◽  
Sachiko Akiyama ◽  
Pertti A Mäkelä ◽  
Seiji Yashiro
Keyword(s):  
Solar Cycle ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Solar Cycle 24 ◽  
Solar Eruptions ◽  
Cycle 24

Regression Analysis of Sunspot Numbers for the Solar Cycle 24 in Comparison to Previous Three Cycles

2014 ◽  
Vol 4 (2) ◽  
pp. 477-483
Author(s):  
Debojyoti Halder
Keyword(s):  
Regression Analysis ◽  
Solar Cycle ◽  
Sunspot Number ◽  
The Sun ◽  
Sunspot Numbers ◽  
Solar Cycle 24 ◽  
Current Cycle ◽  
Cycle 24

Sunspots are temporary phenomena on the photosphere of the Sun which appear visibly as dark spots compared to surrounding regions. Sunspot populations usually rise fast but fall more slowly when observed for any particular solar cycle. The sunspot numbers for the current cycle 24 and the previous three cycles have been plotted for duration of first four years for each of them. It appears that the value of peak sunspot number for solar cycle 24 is smaller than the three preceding cycles. When regression analysis is made it exhibits a trend of slow rising phase of the cycle 24 compared to previous three cycles. Our analysis further shows that cycle 24 is approaching to a longer-period but with smaller occurrences of sunspot number.

Empirical Relationship Between CME Parameters and Geo-effectiveness of Halo CMEs in the Rising Phase of Solar Cycle 24 (2011 – 2013)

Solar Physics ◽  
2015 ◽  
Vol 290 (5) ◽  
pp. 1417-1427 ◽  
Author(s):  
A. Shanmugaraju ◽  
M. Syed Ibrahim ◽  
Y.-J. Moon ◽  
A. Mujiber Rahman ◽  
S. Umapathy
Keyword(s):  
Solar Cycle ◽  
Empirical Relationship ◽  
Solar Cycle 24 ◽  
Halo Cmes ◽  
Cycle 24

scholarly journals Vertical Thermospheric Density Profiles From EUV Solar Occultations Made by PROBA2 LYRA for Solar Cycle 24

Space Weather ◽  
2017 ◽  
Vol 15 (12) ◽  
pp. 1649-1660 ◽  
Author(s):  
E. M. B. Thiemann ◽  
M. Dominique ◽  
M. D. Pilinski ◽  
F. G. Eparvier
Keyword(s):  
Solar Cycle ◽  
Density Profiles ◽  
Solar Cycle 24 ◽  
Cycle 24
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