300 citations · 3.6k across the 79 of their papers we have counts for
80 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…
Origins of Very Low Helium Abundance Streams Detected in the Solar Wind Plasma
Yogesh, N. Gopalswamy, D. Chakrabarty +4
The abundance of helium () in the solar wind exhibits variations typically in the range from 2-5% with respect to solar cycle activity and solar wind velocity. However, the…
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…
What do halo CMEs tell us about solar cycle 25?
Nat Gopalswamy, Grzegorz Michalek, Seiji Yashiro +3
It is known that the weak state of the heliosphere due to diminished solar activity in cycle 24 back-reacted on coronal mass ejections (CMEs) to make them appear wider for a given…
The Solar Cause of the 2022 February 3 Geomagnetic Storm that Led to the Demise of the Starlink Satellites
Nat Gopalswamy, Hong Xie, Seiji Yashiro +1
We report on the solar source of the 2022 February 3 geomagnetic storm of moderate strength that contributed to the loss of 39 Starlink satellites. The geomagnetic storm was caused…