Inner Magnetospheric Response to the Interplanetary Magnetic Field B-y Component: Van Allen Probes and Arase Observations

N. A. Case; D. P. Hartley; A. Grocott; Y. Miyoshi; A. Matsuoka; S. Imajo; S. Kurita; I Shinohara; M. Teramoto

doi:10.1029/2020JA028765

Back

Inner Magnetospheric Response to the Interplanetary Magnetic Field B-y Component: Van Allen Probes and Arase Observations

Journal article

Open access

Peer reviewed

Inner Magnetospheric Response to the Interplanetary Magnetic Field B-y Component: Van Allen Probes and Arase Observations

N. A. Case, D. P. Hartley, A. Grocott, Y. Miyoshi, A. Matsuoka, S. Imajo, S. Kurita, I Shinohara and M. Teramoto

Journal of geophysical research. Space physics, Vol.126(1), 2020

01/01/2021

DOI: 10.1029/2020JA028765

Files and links (1)

url

https://doi.org/10.1029/2020JA028765View

Published (Version of record) Open Access

Abstract

We utilize 17 years of combined Van Allen Probes and Arase data to statistically analyze the response of the inner magnetosphere to the orientation of the interplanetary magnetic field (IMF) B-y component. Past studies have demonstrated that the IMF B-y component introduces a similarly oriented B-y component into the magnetosphere. However, these studies have tended to focus on field lines in the magnetotail only reaching as close to the Earth as the geosynchronous orbit. By exploiting data from these inner magnetospheric spacecraft, we have been able to investigate the response at radial distances of R-E. When subtracting the background magnetic field values, provided by the T01 and IGRF magnetic field models, we find that the IMF B-y component does affect the configuration of the magnetic field lines in the inner magnetosphere. This control is observed throughout the inner magnetosphere, across both hemispheres, all radial distances, and all magnetic local time sectors. The ratio of IMF B-y to the observed B-y residual, also known as the "penetration efficiency," is found to be similar to 0.33. The IMF B-z component is found to increase, or inhibit, this control depending upon its orientation.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: Inner Magnetospheric Response to the Interplanetary Magnetic Field B-y Component: Van Allen Probes and Arase Observations
Creators: N. A. Case - Lancaster University
D. P. Hartley - University of Iowa
A. Grocott - Lancaster University
Y. Miyoshi - Nagoya University
A. Matsuoka - Kyoto University
S. Imajo - Nagoya University
S. Kurita - Kyoto University
I Shinohara - JAXA, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan
M. Teramoto - Kyushu Institute of Technology
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.126(1), 2020
DOI: 10.1029/2020JA028765
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 14
Grant note: 15H05815; 16H06286; 20H01959 / JSPS-KAKENHI; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) 921647; NAS5-01072; 131802; NNN06AA01 / JHU/APL under NASA ST/R000816/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC)
Language: English
Date published: 01/01/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984548669502771

Metrics

3 Record Views

7 Times Cited - Web of Science