117 citations · 960 across the 25 of their papers we have counts for
26 papers
Solar Cycle Variation of Sustained Gamma-ray Emission Events from the Sun and Related Energetic Events
N. Gopalswamy, P. Mäkela, S. Akiyama +2
The sustained gamma ray emission (SGRE) from the Sun is one of the fascinating high energy phenomena closely related to the acceleration of protons to energies >300 MeV. Here we re…
Intense Geomagnetic Storms during Solar Cycles 23-25
N. Gopalswamy, S. Akiyama, S. Yashiro +2
Intense geomagnetic storms are characterized by a minimum value of the Dst index at or below -100 nT. It is well known that these storms are caused by the southward magnetic fields…
Speed and Acceleration of CMEs Associated with Sustained Gamma-Ray Emission Events Observed by Fermi/LAT
P. Mäkelä, N. Gopalswamy, S. Akiyama +2
The sustained gamma-ray emission (SGRE) from the Sun is a prolonged enhancement of >100 MeV gamma-ray emission that extends beyond the flare impulsive phase.The origin of the >300…
The Common Origin of High-energy Protons in Solar Energetic Particle Events and Sustained Gamma-ray Emission from the Sun
N. Gopalswamy, S. Yashiro, P. Makela +2
We report that the number of > 500 MeV protons (Ng) inferred from sustained gamma ray emission (SGRE) from the Sun is significantly correlated with that of protons propagating into…
The Coronal Mass Ejection Visibility Function of Modern Coronagraphs
Angelos Vourlidas, L. A. Balmaceda, H. Xie +1
We analyze the detection capability of Coronal Mass Ejections (CMEs) for all currently operating coronagraphs in space. We define as CMEs events that propagate beyond 10 solar radi…
Effect of the Weakened Heliosphere in Solar Cycle 24 on the Properties of Coronal Mass Ejections
N. Gopalswamy, S. Akiyama, S. Yashiro +3
Solar cycle (SC) 24 has come to an end by the end of 2019, providing information on two full cycles to understand the manifestations of SC 24, the smallest cycle in the Space Age t…