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Galactic Cosmic Ray Increase Associated to an Interplanetary Magnetic Cloud Observed by HAWC

Alejandro Lara,Anushka Udara Abeysekara,Andrea Albert,Ruben Jose Alfaro,César Alvarez, Juan de Dios Álvarez Romero, José Roberto Angeles Camacho,Juan Carlos Arteaga Velazquez, Arun Babu Kollamparambil, Daniel Omar Avila Rojas,Hugo Alberto Ayala Solares,Rishi Babu,Vardan Baghmanyan,Ahron S. Barber,Josefa Becerra Gonzalez,Ernesto Belmont-Moreno,Segev BenZvi,David Berley,Chad Brisbois,Karen S. Caballero Mora,Tomás Capistrán,Alberto Carramiñana,Sabrina Casanova,Oscar Chaparro-Amaro,Umberto Cotti,Jorge Cotzomi,Sara Coutiño de León,Eduardo de la Fuente,Cederik León de León, Lorenzo Diaz,Raquel Diaz Hernandez,Juan Carlos Díaz Vélez,Brenda Dingus,Mora Durocher,Michael DuVernois, Robert Ellsworth,Kristi Engel, María Catalina Espinoza Hernández,Jason Fan,Ke Fang,Mateo Fernandez Alonso,Brian Fick,Henrike Fleischhack, Jorge Luis Flores,Nissim Illich Fraija, Diego Garcia Aguilar,Jose Andres Garcia-Gonzalez,Jose Luis García-Luna,Guillermo García-Torales,Fernando Garfias,Gwenael Giacinti,Hazal Goksu,Maria Magdalena González,Jordan A. Goodman,J. Patrick Harding,Sergio Hernández Cadena, Ian Herzog,Jim Hinton,Binita Hona,Dezhi Huang,Filiberto Hueyotl-Zahuantitla,Michelle Hui,Brian Humensky,Petra Hüntemeyer,Arturo Iriarte,Armelle Jardin-Blicq, Hannah Jhee,Vikas Joshi,David Kieda,Gerd J. Kunde,Samridha Kunwar,Jason LEE,William H. Lee,Dirk Lennarz,Hermes Leon Vargas,Jim Linnemann,Anna Lia Longinotti,Ruben Lopez-Coto,Gilgamesh Luis-Raya, Joe Lundeen,Kelly Malone,Vincent Marandon,Oscar M Martinez,Israel Martinez Castellanos, Humberto Martínez Huerta,Jesús Martínez-Castro,John Matthews,Julie McEnery,Pedro Miranda-Romagnoli,Jorge Antonio Morales Soto,Eduardo Moreno Barbosa,Miguel Mostafa,Amid Nayerhoda,Lukas Nellen,Michael Newbold, Mehr Un Nisa,Roberto Noriega-Papaqui,Laura Olivera-Nieto,Nicola Omodei, Alison Peisker,Yunior Pérez Araujo, Pérez,Chang Dong Rho,Colas Rivière,Daniel Rosa-Gonzalez,Edna Ruiz-Velasco,James Ryan,Humberto Ibarguen Salazar,Francisco Salesa Greus,Andrés Sandoval,Michael Schneider,Harm Schoorlemmer,José Serna-Franco,Gus Sinnis, Andrew James Smith,Wayne Robert Springer,Pooja Surajbali,Ignacio Taboada, Meghan Tanner,Kirsten Tollefson,Ibrahim Torres,Ramiro Torres Escobedo,Rhiannon M. Turner,Fernando Josue Urena Mena,Luis Villaseñor,Xiaojie Wang,Ian James Watson, Thomas Weisgarber,Felix Werner,Elijah Job Willox,Joshua Wood,Gaurang Yodh,Arnulfo Zepeda, Hao Zhou

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)(2021)

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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 theMFR 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.
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