Probing the Magnetosheath Boundaries Using Interstellar Boundary Explorer (IBEX) Orbital Encounters

Hart, Samuel T.; Dayeh, M. A.; Reisenfeld, D. B.; Janzen, P. H.; McComas, D. J.; Allegrini, F.; Fuselier, S. A.; Ogasawara, K.; Szalay, J. R.; Funsten, H. O.; Petrinec, S. M.

doi:10.1029/2021ja029278

Probing the Magnetosheath Boundaries Using Interstellar Boundary Explorer (IBEX) Orbital Encounters

Journal Article · Thu Jun 24 00:00:00 EDT 2021 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1029/2021ja029278· OSTI ID:2470520

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Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Montana, Missoula, MT (United States)
Princeton Univ., NJ (United States)
Southwest Research Institute, San Antonio, TX (United States)
Lockheed Martin Advanced Technology Center, Palo Alto CA (United States)

Inside the magnetosheath, the IBEX-Hi energetic neutral atom (ENA) imager measures a distinct background count rate that is more than 10 times the typical heliospheric ENA emissions observed when IBEX is outside the magnetosheath. The source of this enhancement is magnetosheath ions of solar wind (SW) origin that deflect around the Earth's magnetopause (MP), scatter and neutralize from the anti-sunward part of the IBEX-Hi sunshade, and continue into the instrument as neutral atoms, behaving indistinguishably from ENAs emitted from distant plasma sources. While this background pollutes observations of outer heliospheric ENAs, it provides a clear signature of IBEX crossings over the magnetospheric boundaries. In this study, we investigate IBEX encounters with the magnetosheath boundaries using ~8 yr of orbital data, and we determine the MP and bow shock (BS) locations derived from this background signal. We find 280 BS crossings from X_GSE ~ 11 R_e to X_GSE ~ –36 R_e and 241 MP crossings from X_GSE ~ 6 R_e to X_GSE ~ –48 R_e. We compare IBEX BS and MP crossing locations to those from IMP-8, Geotail, Cluster, Magion-4, ISEE, and Magnetospheric Multiscale Mission, and we find that IBEX crossing locations overlap with the BS and MP locations inferred from these other data sets. In this paper, we demonstrate how IBEX can be used to identify magnetosheath crossings, and extend boundary observations well past the terminator, thus further constraining future models of magnetosheath boundaries. Furthermore, we use the IBEX data set to show observational evidence of near-Earth magnetotail squeezing during periods of strong interplanetary magnetic field B_y.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2470520

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 7 Vol. 126; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
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Probing the Magnetosheath Boundaries Using Interstellar Boundary Explorer (IBEX) Orbital Encounters

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