Magnetosphere‐ionosphere mapping at Jupiter: Quantifying the effects of using different internal field models

Marissa F. Vogt; Emma J. Bunce; Margaret G. Kivelson; Krishan K. Khurana; Raymond J. Walker; Aikaterini Radioti; Bertrand Bonfond; Denis Grodent

doi:10.1002/2014ja020729

journal article Apr 01, 2015

Magnetosphere‐ionosphere mapping at Jupiter: Quantifying the effects of using different internal field models

Emma J. Bunce Margaret G. Kivelson Krishan K. Khurana Raymond J. Walker Aikaterini Radioti Bertrand Bonfond Denis Grodent

Journal of Geophysical Research: Space Physics Vol. 120 No. 4 pp. 2584-2599 · Wiley

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Abstract

AbstractThe lack of global field models accurate beyond the inner magnetosphere (<30 RJ) makes it difficult to relate Jupiter's polar auroral features to magnetospheric source regions. We recently developed a model that maps Jupiter's equatorial magnetosphere to the ionosphere using a flux equivalence calculation that requires equal flux at the equatorial and ionospheric ends of flux tubes. This approach is more accurate than tracing field lines in a global field model but only if it is based on an accurate model of Jupiter's internal field. At present there are three widely used internal field models—Voyager Io Pioneer 4 (VIP4), the Grodent Anomaly Model (GAM), and VIP Anomaly Longitude (VIPAL). The purpose of this study is to quantify how the choice of an internal field model affects the mapping of various auroral features using the flux equivalence calculation. We find that different internal field models can shift the ionospheric mapping of points in the equatorial plane by several degrees and shift the magnetospheric mapping to the equator by ~30 RJ radially and by less than 1 h in local time. These shifts are consistent with differences in how well each model maps the Ganymede footprint, underscoring the need for more accurate Jovian internal field models. We discuss differences in the mapping of specific auroral features and the size and location of the open/closed field line boundary. Understanding these differences is important for the continued analysis of Hubble Space Telescope images and in planning for Juno's arrival at Jupiter in 2016.

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Metrics

41

Citations

47

References

Details

Published: Apr 01, 2015
Vol/Issue: 120(4)
Pages: 2584-2599
License: View

Authors

M

Marissa F. Vogt

Center for Space Physics Boston University Boston Massachusetts USA; Previously at Department of Physics and Astronomy University of Leicester Leicester UK

E

Emma J. Bunce

Department of Physics and Astronomy University of Leicester Leicester UK

M

Margaret G. Kivelson

Department of Earth, Planetary, and Space Sciences UCLA Los Angeles California USA; Department of Atmospheric, Oceanic, and Space Science University of Michigan Ann Arbor Michigan USA

K

Krishan K. Khurana

Department of Earth, Planetary, and Space Sciences UCLA Los Angeles California USA

R

Raymond J. Walker

Department of Earth, Planetary, and Space Sciences UCLA Los Angeles California USA; Previously at National Science Foundation Arlington Virginia USA

A

Aikaterini Radioti

LPAP Université de Liège Liege Belgium

B

Bertrand Bonfond

LPAP Université de Liège Liege Belgium

D

Denis Grodent

LPAP Université de Liège Liege Belgium

Funding

UK Science and Technology Facilities Council Consolidated Award: ST/K001000/1

Cite This Article

Marissa F. Vogt, Emma J. Bunce, Margaret G. Kivelson, et al. (2015). Magnetosphere‐ionosphere mapping at Jupiter: Quantifying the effects of using different internal field models. Journal of Geophysical Research: Space Physics, 120(4), 2584-2599. https://doi.org/10.1002/2014ja020729

Magnetosphere‐ionosphere mapping at Jupiter: Quantifying the effects of using different internal field models

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