ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Hiroko Miyahara (ICRR)
Title: Possible Effects of Galactic Cosmic Rays on Climate and Weather
Date (JST): Mon, Apr 22, 2013, 13:30 - 14:30
Place: Seminar Room A
Related File: 849.pdf
Abstract: We study decadal to multi-decadal variations of galactic cosmic-ray flux incident to the earth based on the content of cosmic-ray induced carbon-14 and beryllium-10 in tree rings and ice cores. We find that the time profile of cosmic-ray flux is variant depending on the state of solar activity level, possibly due to the change in the heliospheric environment.
We show that such characteristic variations might be of help in analyzing the cosmic-ray impact on climate variations. It is shown that climate has a frequency component related to the solar magnetic polarity reversals.
In this seminar, we also discuss possible impact of cosmic rays on monthly-scale cloud activities at the equatorial regions.