Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections

L. R. Alves; L. A. Da Silva; V. M. Souza; D. G. Sibeck; P. R. Jauer; L. E A Vieira; B. M. Walsh; M. V D Silveira; J. P. Marchezi; M. Rockenbach; A. Dal Lago; O. Mendes; B. T. Tsurutani; D. Koga; S. G. Kanekal; D. N. Baker; J. R. Wygant; C. A. Kletzing

doi:10.1002/2015GL067066

Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections

L. R. Alves, L. A. Da Silva, V. M. Souza, D. G. Sibeck, P. R. Jauer, L. E A Vieira, B. M. Walsh, M. V D Silveira, J. P. Marchezi, M. Rockenbach, A. Dal Lago, O. Mendes, B. T. Tsurutani, D. Koga, S. G. Kanekal, D. N. Baker, J. R. Wygant, C. A. Kletzing

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Magnetopause shadowing and wave-particle interactions are recognized as the two primary mechanisms for losses of electrons from the outer radiation belt. We investigate these mechanisms, using satellite observations both in interplanetary space and within the magnetosphere and particle drift modeling. Two interplanetary shocks/sheaths impinged upon the magnetopause causing a relativistic electron flux dropout. The magnetic cloud (MC) and interplanetary structure sunward of the MC had primarily northward magnetic field, perhaps leading to a concomitant lack of substorm activity and a 10 daylong quiescent period. The arrival of two shocks caused an unusual electron flux dropout. Test-particle simulations have shown ∼ 2 to 5 MeV energy, equatorially mirroring electrons with initial values of L≥5.5 can be lost to the magnetosheath via magnetopause shadowing alone. For electron losses at lower L-shells, coherent chorus wave-driven pitch angle scattering and ULF wave-driven radial transport have been shown to be viable mechanisms.

Original language	English (US)
Pages (from-to)	978-987
Number of pages	10
Journal	Geophysical Research Letters
Volume	43
Issue number	3
DOIs	https://doi.org/10.1002/2015GL067066
State	Published - Feb 16 2016

Keywords

adiabatic radial transport
magnetopause shadowing
nonadiabatic radial transport
outer radiation belt dynamics
relativistic electron loss

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Alves, L. R., Da Silva, L. A., Souza, V. M., Sibeck, D. G., Jauer, P. R., Vieira, L. E. A., Walsh, B. M., Silveira, M. V. D., Marchezi, J. P., Rockenbach, M., Lago, A. D., Mendes, O., Tsurutani, B. T., Koga, D., Kanekal, S. G., Baker, D. N., Wygant, J. R., & Kletzing, C. A. (2016). Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections. Geophysical Research Letters, 43(3), 978-987. https://doi.org/10.1002/2015GL067066

Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections. / Alves, L. R.; Da Silva, L. A.; Souza, V. M.; Sibeck, D. G.; Jauer, P. R.; Vieira, L. E A; Walsh, B. M.; Silveira, M. V D; Marchezi, J. P.; Rockenbach, M.; Lago, A. Dal; Mendes, O.; Tsurutani, B. T.; Koga, D.; Kanekal, S. G.; Baker, D. N.; Wygant, J. R.; Kletzing, C. A.

In: Geophysical Research Letters, Vol. 43, No. 3, 16.02.2016, p. 978-987.

Research output: Contribution to journal › Article › peer-review

Alves, LR, Da Silva, LA, Souza, VM, Sibeck, DG, Jauer, PR, Vieira, LEA, Walsh, BM, Silveira, MVD, Marchezi, JP, Rockenbach, M, Lago, AD, Mendes, O, Tsurutani, BT, Koga, D, Kanekal, SG, Baker, DN, Wygant, JR & Kletzing, CA 2016, 'Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections', Geophysical Research Letters, vol. 43, no. 3, pp. 978-987. https://doi.org/10.1002/2015GL067066

Alves, L. R. ; Da Silva, L. A. ; Souza, V. M. ; Sibeck, D. G. ; Jauer, P. R. ; Vieira, L. E A ; Walsh, B. M. ; Silveira, M. V D ; Marchezi, J. P. ; Rockenbach, M. ; Lago, A. Dal ; Mendes, O. ; Tsurutani, B. T. ; Koga, D. ; Kanekal, S. G. ; Baker, D. N. ; Wygant, J. R. ; Kletzing, C. A. / Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections. In: Geophysical Research Letters. 2016 ; Vol. 43, No. 3. pp. 978-987.

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abstract = "Magnetopause shadowing and wave-particle interactions are recognized as the two primary mechanisms for losses of electrons from the outer radiation belt. We investigate these mechanisms, using satellite observations both in interplanetary space and within the magnetosphere and particle drift modeling. Two interplanetary shocks/sheaths impinged upon the magnetopause causing a relativistic electron flux dropout. The magnetic cloud (MC) and interplanetary structure sunward of the MC had primarily northward magnetic field, perhaps leading to a concomitant lack of substorm activity and a 10 daylong quiescent period. The arrival of two shocks caused an unusual electron flux dropout. Test-particle simulations have shown ∼ 2 to 5 MeV energy, equatorially mirroring electrons with initial values of L≥5.5 can be lost to the magnetosheath via magnetopause shadowing alone. For electron losses at lower L-shells, coherent chorus wave-driven pitch angle scattering and ULF wave-driven radial transport have been shown to be viable mechanisms.",

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AU - Jauer, P. R.

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AU - Kanekal, S. G.

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N2 - Magnetopause shadowing and wave-particle interactions are recognized as the two primary mechanisms for losses of electrons from the outer radiation belt. We investigate these mechanisms, using satellite observations both in interplanetary space and within the magnetosphere and particle drift modeling. Two interplanetary shocks/sheaths impinged upon the magnetopause causing a relativistic electron flux dropout. The magnetic cloud (MC) and interplanetary structure sunward of the MC had primarily northward magnetic field, perhaps leading to a concomitant lack of substorm activity and a 10 daylong quiescent period. The arrival of two shocks caused an unusual electron flux dropout. Test-particle simulations have shown ∼ 2 to 5 MeV energy, equatorially mirroring electrons with initial values of L≥5.5 can be lost to the magnetosheath via magnetopause shadowing alone. For electron losses at lower L-shells, coherent chorus wave-driven pitch angle scattering and ULF wave-driven radial transport have been shown to be viable mechanisms.

AB - Magnetopause shadowing and wave-particle interactions are recognized as the two primary mechanisms for losses of electrons from the outer radiation belt. We investigate these mechanisms, using satellite observations both in interplanetary space and within the magnetosphere and particle drift modeling. Two interplanetary shocks/sheaths impinged upon the magnetopause causing a relativistic electron flux dropout. The magnetic cloud (MC) and interplanetary structure sunward of the MC had primarily northward magnetic field, perhaps leading to a concomitant lack of substorm activity and a 10 daylong quiescent period. The arrival of two shocks caused an unusual electron flux dropout. Test-particle simulations have shown ∼ 2 to 5 MeV energy, equatorially mirroring electrons with initial values of L≥5.5 can be lost to the magnetosheath via magnetopause shadowing alone. For electron losses at lower L-shells, coherent chorus wave-driven pitch angle scattering and ULF wave-driven radial transport have been shown to be viable mechanisms.

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Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections

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