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Formation and motion of a transpolar arc in response to dayside and nightside reconnection

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Formation and motion of a transpolar arc in response to dayside and nightside reconnection. / Milan, S. E.; Hubert, B.; Grocott, A.
In: Journal of Geophysical Research, Vol. 110, No. A1, A01212, 19.01.2005.

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Milan SE, Hubert B, Grocott A. Formation and motion of a transpolar arc in response to dayside and nightside reconnection. Journal of Geophysical Research. 2005 Jan 19;110(A1):A01212. doi: 10.1029/2004JA010835

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Milan, S. E. ; Hubert, B. ; Grocott, A. / Formation and motion of a transpolar arc in response to dayside and nightside reconnection. In: Journal of Geophysical Research. 2005 ; Vol. 110, No. A1.

Bibtex

@article{cb5949d8d1f54157ab35b95b534b45dc,
title = "Formation and motion of a transpolar arc in response to dayside and nightside reconnection",
abstract = "We trace the formation and subsequent motion of a transpolar arc in response to dayside and nightside reconnection. Both high- and low-latitude dayside reconnection are observed, as well as periods of substorm and nonsubstorm nightside reconnection, during the 7-hour interval of interest on 19 January 2002. We speculate that the arc is formed by a burst of nonsubstorm nightside reconnection and that its subsequent motion is controlled predominantly by the rate of dayside high-latitude reconnection, siphoning open flux from the dusk sector polar cap to the dawn sector. The observations allow us to quantify the rates of reconnection: on the nightside, 35 and 100 kV during nonsubstorm- and substorm-related bursts, respectively; on the dayside, 30 and 100 kV for high- and low-latitude reconnection. The latter values give effective merging line lengths of 1 and 5.5 RE for northward and southward interplanetary magnetic field, respectively. We suggest that transpolar arc motion will be controlled not only by the By component of the IMF but also by the relative magnitude of the Bz component, when ∣By∣ > Bz motion will be dawnward for By < 0 nT and duskward for By > 0 nT; however, when Bz > ∣By∣, we expect that the arc will move toward the noon-midnight meridian of the polar cap.",
keywords = "reconnection, transpolar arc",
author = "Milan, {S. E.} and B. Hubert and A. Grocott",
note = "Copyright 2005 by the American Geophysical Union.",
year = "2005",
month = jan,
day = "19",
doi = "10.1029/2004JA010835",
language = "English",
volume = "110",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "A1",

}

RIS

TY - JOUR

T1 - Formation and motion of a transpolar arc in response to dayside and nightside reconnection

AU - Milan, S. E.

AU - Hubert, B.

AU - Grocott, A.

N1 - Copyright 2005 by the American Geophysical Union.

PY - 2005/1/19

Y1 - 2005/1/19

N2 - We trace the formation and subsequent motion of a transpolar arc in response to dayside and nightside reconnection. Both high- and low-latitude dayside reconnection are observed, as well as periods of substorm and nonsubstorm nightside reconnection, during the 7-hour interval of interest on 19 January 2002. We speculate that the arc is formed by a burst of nonsubstorm nightside reconnection and that its subsequent motion is controlled predominantly by the rate of dayside high-latitude reconnection, siphoning open flux from the dusk sector polar cap to the dawn sector. The observations allow us to quantify the rates of reconnection: on the nightside, 35 and 100 kV during nonsubstorm- and substorm-related bursts, respectively; on the dayside, 30 and 100 kV for high- and low-latitude reconnection. The latter values give effective merging line lengths of 1 and 5.5 RE for northward and southward interplanetary magnetic field, respectively. We suggest that transpolar arc motion will be controlled not only by the By component of the IMF but also by the relative magnitude of the Bz component, when ∣By∣ > Bz motion will be dawnward for By < 0 nT and duskward for By > 0 nT; however, when Bz > ∣By∣, we expect that the arc will move toward the noon-midnight meridian of the polar cap.

AB - We trace the formation and subsequent motion of a transpolar arc in response to dayside and nightside reconnection. Both high- and low-latitude dayside reconnection are observed, as well as periods of substorm and nonsubstorm nightside reconnection, during the 7-hour interval of interest on 19 January 2002. We speculate that the arc is formed by a burst of nonsubstorm nightside reconnection and that its subsequent motion is controlled predominantly by the rate of dayside high-latitude reconnection, siphoning open flux from the dusk sector polar cap to the dawn sector. The observations allow us to quantify the rates of reconnection: on the nightside, 35 and 100 kV during nonsubstorm- and substorm-related bursts, respectively; on the dayside, 30 and 100 kV for high- and low-latitude reconnection. The latter values give effective merging line lengths of 1 and 5.5 RE for northward and southward interplanetary magnetic field, respectively. We suggest that transpolar arc motion will be controlled not only by the By component of the IMF but also by the relative magnitude of the Bz component, when ∣By∣ > Bz motion will be dawnward for By < 0 nT and duskward for By > 0 nT; however, when Bz > ∣By∣, we expect that the arc will move toward the noon-midnight meridian of the polar cap.

KW - reconnection

KW - transpolar arc

U2 - 10.1029/2004JA010835

DO - 10.1029/2004JA010835

M3 - Journal article

VL - 110

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - A1

M1 - A01212

ER -