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A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity

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A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity. / Milan, S. E.; Grocott, A.; Forsyth, C. et al.
In: Annales Geophysicae, Vol. 27, No. 2, 11.02.2009, p. 659-668.

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Milan SE, Grocott A, Forsyth C, Imber SM, Boakes PD, Hubert B. A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity. Annales Geophysicae. 2009 Feb 11;27(2):659-668. doi: 10.5194/angeo-27-659-2009

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@article{095c6095a0894ee6b9d50ed1b45da69b,
title = "A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity",
abstract = " We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer (IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms. We subdivide the substorms by onset latitude, a measure of the open magnetic flux in the magnetosphere, and determine average auroral images before and after substorm onset, for both electron and proton aurora. Our results indicate that substorms are more intense in terms of auroral brightness when the open flux content of the magnetosphere is larger, and that magnetic flux closure is more significant. The increase in auroral brightness at onset is larger for electrons than protons. We also show that there is a dawn-dusk offset in the location of the electron and proton aurora that mirrors the relative locations of the region 1 and region 2 current systems. Superposed epoch analyses of the solar wind, interplanetary magnetic field, and geomagnetic indices for the substorms under study indicate that dayside reconnection is expected to occur at a faster rate prior to low latitude onsets, but also that the ring current is enhanced for these events.",
author = "Milan, {S. E.} and A. Grocott and C. Forsyth and Imber, {S. M.} and Boakes, {P. D.} and B. Hubert",
note = "{\textcopyright} Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.",
year = "2009",
month = feb,
day = "11",
doi = "10.5194/angeo-27-659-2009",
language = "English",
volume = "27",
pages = "659--668",
journal = "Annales Geophysicae",
issn = "0992-7689",
publisher = "European Geosciences Union",
number = "2",

}

RIS

TY - JOUR

T1 - A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery

T2 - open magnetic flux control of substorm intensity

AU - Milan, S. E.

AU - Grocott, A.

AU - Forsyth, C.

AU - Imber, S. M.

AU - Boakes, P. D.

AU - Hubert, B.

N1 - © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.

PY - 2009/2/11

Y1 - 2009/2/11

N2 - We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer (IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms. We subdivide the substorms by onset latitude, a measure of the open magnetic flux in the magnetosphere, and determine average auroral images before and after substorm onset, for both electron and proton aurora. Our results indicate that substorms are more intense in terms of auroral brightness when the open flux content of the magnetosphere is larger, and that magnetic flux closure is more significant. The increase in auroral brightness at onset is larger for electrons than protons. We also show that there is a dawn-dusk offset in the location of the electron and proton aurora that mirrors the relative locations of the region 1 and region 2 current systems. Superposed epoch analyses of the solar wind, interplanetary magnetic field, and geomagnetic indices for the substorms under study indicate that dayside reconnection is expected to occur at a faster rate prior to low latitude onsets, but also that the ring current is enhanced for these events.

AB - We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer (IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms. We subdivide the substorms by onset latitude, a measure of the open magnetic flux in the magnetosphere, and determine average auroral images before and after substorm onset, for both electron and proton aurora. Our results indicate that substorms are more intense in terms of auroral brightness when the open flux content of the magnetosphere is larger, and that magnetic flux closure is more significant. The increase in auroral brightness at onset is larger for electrons than protons. We also show that there is a dawn-dusk offset in the location of the electron and proton aurora that mirrors the relative locations of the region 1 and region 2 current systems. Superposed epoch analyses of the solar wind, interplanetary magnetic field, and geomagnetic indices for the substorms under study indicate that dayside reconnection is expected to occur at a faster rate prior to low latitude onsets, but also that the ring current is enhanced for these events.

U2 - 10.5194/angeo-27-659-2009

DO - 10.5194/angeo-27-659-2009

M3 - Journal article

VL - 27

SP - 659

EP - 668

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 2

ER -