Anisotropic Forbush decrease of 24 March 2024: First look
Issued Date
2024-01-01
Resource Type
ISSN
02731177
eISSN
18791948
Scopus ID
2-s2.0-85201687356
Journal Title
Advances in Space Research
Rights Holder(s)
SCOPUS
Bibliographic Citation
Advances in Space Research (2024)
Suggested Citation
Mishev A., Larsen N., Asvestari E., Sáiz A., Ann Shea M., Strauss D.T., Ruffolo D., Banglieng C., Seunarine S., Duldig M.L., Gil A., Blanco J.J., García-Población O., Cervino-Solana P., Adams, J.H., Usoskin I. Anisotropic Forbush decrease of 24 March 2024: First look. Advances in Space Research (2024). doi:10.1016/j.asr.2024.08.027 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/100634
Title
Anisotropic Forbush decrease of 24 March 2024: First look
Author's Affiliation
Center for Space Plasma and Aeronomic Research
University of Wisconsin-River Falls
Rajamangala University of Technology Thanyaburi (RMUTT)
North-West University
Universidad de Alcalá
University of Tasmania
Sodankylä Geophysical Observatory
Oulun Yliopisto
Mahidol University
Helsingin Yliopisto
Siedlce University of Natural Sciences and Humanities
100
University of Wisconsin-River Falls
Rajamangala University of Technology Thanyaburi (RMUTT)
North-West University
Universidad de Alcalá
University of Tasmania
Sodankylä Geophysical Observatory
Oulun Yliopisto
Mahidol University
Helsingin Yliopisto
Siedlce University of Natural Sciences and Humanities
100
Corresponding Author(s)
Other Contributor(s)
Abstract
A strong Forbush decrease, i.e., suppression of the flux of galactic cosmic rays recorded on Earth, was observed by the global network of ground-based neutron monitors (NMs) on 24 – 25 March 2024. The decrease was very unusual as characterised by so rapid recovery that a false Ground-level enhancement (GLE) alarm was produced by the corresponding warning systems. Here we present the first comprehensive collection and analysis of the available data for this event. The event was highly anisotropic as exhibited in a 3-h spread of the deep-phase timing for different NMs. The anisotropy was focused nearly at the anti-sunward direction with a narrow cone of 20 – 30°. The heliospheric situation leading to this unusual Forbush decrease was quite complex. An analysis of first look records was performed, considering the stations acceptance, taking into account the complex geomagnetic conditions. A leader fraction analysis indicates that the recovery phase of the event was rigidity-independent and had essentially the same spectral shape as the pre-event period. A summary of the solar-terrestrial phenomena is provided to assist in future work on modelling this complex event.