Galactic Cosmic Ray increase associated with an interplanetary magnetic cloud observed by HAWC

the HAWC Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present the observation of an anomalous increment of the galactic cosmic ray (GCR) flux observed by the HAWC array during October 2016. We propose that this anisotropy of the GCR flux was caused by a magnetic flux rope (MFR) i. e., by the helicoidal magnetic field of an interplanetary coronal mass ejection observed at 1 AU at the same time. We computed the trajectory of protons with energy in the range of 10 to 60 GeV, traveling inside the helicoidal magnetic field observed in situ. The direction of these particles changes towards the axis of the MFR resulting in an anisotropy of the GCR flux along this axis. This model shows that the alignment between the MFR axis and the HAWC's asymptotic direction, combined with the high sensitivity of HAWC, allowed us to observe the effect of the passage of the MFR on the GCR flux. We present the HAWC observation associated with the passage of the MFR as well as the heliospheric circumstances around such phenomenon.

Original languageEnglish
Title of host publicationGalactic Cosmic Ray increase associated with an interplanetary magnetic cloud observed by HAWC
Volume395
Publication statusPublished - 18 Mar 2022
Event37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany
Duration: 12 Jul 202123 Jul 2021

Publication series

NameProceedings of Science
PublisherSissa Medialab Srl

Conference

Conference37th International Cosmic Ray Conference, ICRC 2021
Country/TerritoryGermany
CityVirtual, Berlin
Period12/7/2123/7/21

Bibliographical note

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.

All Science Journal Classification (ASJC) codes

  • General

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