117 citations · 960 across the 25 of their papers we have counts for
22 papers · 1 filter
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…
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…
Source of Energetic Protons in the 2014 September 1 Sustained Gamma-ray Emission Event
N. Gopalswamy, P. Mäkelä, S. Yashiro +3
We report on the source of greater than 300 MeV protons during the SOL2014-09-01 sustained gamma-ray emission (SGRE) event based on multi-wavelength data from a wide array of space…
On the Shock Source of Sustained Gamma-Ray Emission from the Sun
N Gopalswamy, P. Makela, S. Yashiro +3
It has recently been shown that the spatially and temporally extended gamma-ray emission in solar eruptions are caused by greater than 300 MeV protons precipitating on the Sun from…