Relationship between Na layer and CNA variations observed at Syowa, Antarctic

Abstract We have performed a statistical data analysis on relationship between simultaneous Na density data and cosmic noise absorption (CNA) data, which is an indicator for energetic particle precipitation, obtained at Syowa, Antarctic in 2000–2002. It is found that the Na densities around the tops...

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Bibliographic Details
Published in:Earth, Planets and Space
Main Authors: T. T. Tsuda, Y. -M. Tanaka, R. Tozu, K. Takizawa, M. K. Ejiri, T. Nishiyama, T. D. Kawahara, T. Nakamura
Format: Article in Journal/Newspaper
Language:English
Published: SpringerOpen 2021
Subjects:
Na layer
CNA
Energetic particle precipitation
Geomagnetic activity
Polar region
Syowa
Geography. Anthropology. Recreation
G
Geodesy
QB275-343
Geology
QE1-996.5
Antarctic
Antarc*
Online Access:https://doi.org/10.1186/s40623-020-01335-7
https://doaj.org/article/15cbe0ed2a6946418b0c0c41bb3c1b52
Description
Summary:Abstract We have performed a statistical data analysis on relationship between simultaneous Na density data and cosmic noise absorption (CNA) data, which is an indicator for energetic particle precipitation, obtained at Syowa, Antarctic in 2000–2002. It is found that the Na densities around the topside of Na layers (above $$\sim 95 \,\hbox {km}$$ ∼ 95 km height) tended to be smaller when the CNA was larger. The amounts of Na density responses, i.e., Na density decrease or Na loss, were increasing with magnetic local time (MLT) from dusk hours to dawn hours, and those of CNA responses, i.e., CNA increase, were also increasing with MLT. Thus, there were clear negative correlations between the Na density and CNA variations. These results indicate that the Na loss around the topside of Na layer would be induced by the energetic particle precipitation, and its effect would be more severe in dawn hours.

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