scholarly journals Middle and low latitudes hemispheric asymmetries in ∑O/N2 and TEC during intense magnetic storms of Solar Cycle 24

2021 ◽  
Author(s):  
Waqar Younas ◽  
Majid Khan ◽  
C. Amory-Mazaudier ◽  
Paul O. Amaechi ◽  
R. Fleury
Keyword(s):  
Solar Cycle ◽  
Magnetic Storms ◽  
Hemispheric Asymmetries ◽  
Low Latitudes ◽  
Solar Cycle 24 ◽  
Cycle 24

Investigation of the possibility of GIC development in Greece during the strongest magnetic storms of solar cycle 24 

2021 ◽  
Author(s):  
Adamantia Zoe Boutsi ◽  
Georgios Balasis ◽  
Ioannis A. Daglis ◽  
Kanaris Tsinganos ◽  
Omiros Giannakis
Keyword(s):  
Solar Cycle ◽  
Magnetic Storms ◽  
Geoelectric Field ◽  
Storm Events ◽  
Power Networks ◽  
Geomagnetically Induced Currents ◽  
Middle Latitudes ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Index Value

<p>Geomagnetically Induced Currents (GIC) constitute an integral part of the space weather research and a subject of ever-growing attention for countries located in the low and middle latitudes. A series of recent studies highlights the importance of considering GIC risks for the Mediterranean region. Here, we exploit data from the HellENIc GeoMagnetic Array (ENIGMA), which is located in Greece, complemented by magnetic observatories in Italy, to calculate corresponding values of the GIC index, i.e., a proxy of the geoelectric field calculated entirely from geomagnetic field variations. We perform our analysis for the most intense magnetic storms (Dst<-150 nT) of solar cycle 24. Our results show a good correlation between the storm sudden commencement (SSC) and an increase of the GIC index value. These investigations indicate that despite the elevated amplitude of the GIC index the associated risk remains at low level for the power networks in Greece and Italy during the considered storm events.</p>

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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