Solar Magnetic Polarity Effect on Neutron Monitor Count Rates: Comparing Latitude Surveys and Antarctic Stations
Issued Date
2023-11-01
Resource Type
ISSN
0004637X
eISSN
15384357
Scopus ID
2-s2.0-85177600440
Journal Title
Astrophysical Journal
Volume
958
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Astrophysical Journal Vol.958 No.1 (2023)
Suggested Citation
Poopakun K., Nuntiyakul W., Khamphakdee S., Seripienlert A., Ruffolo D., Evenson P., Jiang P., Chuanraksasat P., Munakata K., Duldig M.L., Humble J.E., Madsen J., Soonthornthum B., Komonjinda S. Solar Magnetic Polarity Effect on Neutron Monitor Count Rates: Comparing Latitude Surveys and Antarctic Stations. Astrophysical Journal Vol.958 No.1 (2023). doi:10.3847/1538-4357/ad02f1 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/91241
Title
Solar Magnetic Polarity Effect on Neutron Monitor Count Rates: Comparing Latitude Surveys and Antarctic Stations
Other Contributor(s)
Abstract
The Galactic cosmic-ray spectrum manifests pronounced variations over the 11 yr sunspot cycle and more subtle variations over the 22 yr solar magnetic cycle. An important tool to study these variations is repeated latitude surveys with neutron monitors (NMs) on board icebreakers in conjunction with land-based references. We revisit 13 annual latitude surveys from 1994 to 2007 using reference data from the Mawson NM instead of McMurdo NM (which closed in 2017). We then consider two more latitude surveys (2018 and 2019) with a monitor similar to the 3NM64 in the previous surveys but without lead rings around the central tube, a so-called “semi-leaded neutron monitor.” The new surveys extend the linear relationship among data taken at different cutoff rigidity ranges. They also confirm the “crossover” measured near solar minima during epochs of opposite solar magnetic polarity and the absence of a crossover for epochs having the same solar magnetic polarity.