4-6 May 2015
Union South
US/Central timezone

Gamma Rays from Cosmic Ray Collisions with the Sun Observed with Fermi

4 May 2015, 16:10
Northwoods (Union South)


Union South

1308 West Dayton Street, Madison, WI 53706
High-Energy Gamma-Ray Astrophysics Gamma Rays


Mr Kenny, Chun Yu NG (CCAPP, The Ohio State University)


The Sun is a bright gamma ray source due to interactions between cosmic rays and the solar atmosphere. These gamma rays were detected from 0.1 to 10 GeV by Fermi with 18 months of data, and were found to be in disagreement with theoretical predictions. In this work we update the measurement using 6 years of Fermi data. The improved statistics allow us to detect the gamma rays up to 100 GeV and discover new features in the gamma ray spectrum. This provides a solid basis for revisiting the theoretical modeling of cosmic ray interactions with the Sun. Thorough understanding of the hadronic gamma ray production process helps predicting the corresponding neutrino flux, which may allow the Sun to be detectable by IceCube.

Primary author

Mr Kenny, Chun Yu NG (CCAPP, The Ohio State University)


Prof. Annika Peter (CCAPP, The Ohio State University) Carsten Rott (Sungkyunkwan University) Prof. John Beacom (CCAPP, The Ohio State University)

Presentation Materials