Investigation of an exceptionally long Forbush decrease-like dip in AMS02 galactic proton observations:  From the Sun to the Heliosphere

Muhammed Aslam Ottupara (University of Glasgow)

Wednesday 16th October 15:00-16:00 Maths 311B

Abstract

We will demonstrate how we can trace an effect observed in near-Earth space (1 AU) back to its origin at the solar surface by coupling a three-dimensional particle transport model with the Active Region Topology (ARTop) code, alongside available observations. Specifically, we investigate an unexpected, large, and long-term decrease (depression) in the galactic cosmic ray flux reported by the Alpha Magnetic Spectrometer (AMS02), located on the International Space Station at 1 AU, during the second half of 2017. Galactic cosmic ray observations—both averaged over Bartel rotations and daily-resolution data from AMS02—are analyzed in conjunction with solar wind plasma and magnetic field measurements, HMI magnetograms, and AIA images to explore the cause and impact of this depression. The potential early onset of coronal mass ejections (CMEs) as a cause of this depression, and the possibility of a mini-solar cycle, are examined using the ARTop code. Additionally, the 3D numerical heliospheric modulation model, based on Parker’s transport equation, is applied to simulate AMS02 observations for different cosmic ray species. This enables us to understand how the primary modulation processes varied during this period, based on both the modeling results and the observed data. Furthermore, we will explain why such investigations and the integration of different models are important and provide valuable insights into space weather research.

Add to your calendar

Download event information as iCalendar file (only this event)