Magnetospheric current systems during stormtime sawtooth events

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Magnetospheric current systems during stormtime sawtooth events. / Pulkkinen, T. I.; Ganushkina, N. Y.; Tanskanen, E. I.; Kubyshkina, M.; Reeves, G. D.; Thomsen, M. F.; Russell, C. T.; Singer, H. J.; Slavin, J. A.; Gjerloev, J.

In: Journal of geophysical research: Space physics, Vol. 111, No. A11, ARTN A11S17, 28.09.2006.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Pulkkinen, TI, Ganushkina, NY, Tanskanen, EI, Kubyshkina, M, Reeves, GD, Thomsen, MF, Russell, CT, Singer, HJ, Slavin, JA & Gjerloev, J 2006, 'Magnetospheric current systems during stormtime sawtooth events' Journal of geophysical research: Space physics, vol. 111, no. A11, ARTN A11S17. https://doi.org/10.1029/2006JA011627

APA

Pulkkinen, T. I., Ganushkina, N. Y., Tanskanen, E. I., Kubyshkina, M., Reeves, G. D., Thomsen, M. F., ... Gjerloev, J. (2006). Magnetospheric current systems during stormtime sawtooth events. Journal of geophysical research: Space physics, 111(A11), [ARTN A11S17]. https://doi.org/10.1029/2006JA011627

Vancouver

Author

Pulkkinen, T. I. ; Ganushkina, N. Y. ; Tanskanen, E. I. ; Kubyshkina, M. ; Reeves, G. D. ; Thomsen, M. F. ; Russell, C. T. ; Singer, H. J. ; Slavin, J. A. ; Gjerloev, J. / Magnetospheric current systems during stormtime sawtooth events. In: Journal of geophysical research: Space physics. 2006 ; Vol. 111, No. A11.

Bibtex - Download

@article{1997615ccd0c4585b3f1c1b564538c07,
title = "Magnetospheric current systems during stormtime sawtooth events",
abstract = "The sawtooth event period embedded in a storm interval on 2001-10-22 is analyzed using magnetic field modeling techniques. The model current systems show that sawtooth injections are associated with strong stretching of both the nightside and dusk-sector magnetic field prior to the injection and a partial disruption of that current at the time of the injection. The currents are strongest near geosynchronous distance and in the premidnight sector. The strong dusk-sector field stretching produces very fast proton drift speeds, which can explain the near-simultaneous occurrence of the injections over a wide local time sector. Comparison of sawtooth periods with nonstorm substorms indicates that the tail field behavior resembles that of nonstorm substorms, but that the consequences of the stretching/dipolarization cycle are different from nonstorm times. As the drifting protons during sawtooth events are mostly on open drift paths, the symmetric ring current is only slightly affected, while large variations are seen in the asymmetric ring current. The three-spacecraft magnetic field measurements together with the Dst index were sufficient to constrain the magnetic field model to give a reasonably accurate global magnetic field representation, as confirmed by an independent test using measurements not used in the fitting. Thus we conclude that the empirical modeling methods can be quite reliable in predicting the large-scale fields when suitable observations are available.",
keywords = "DAWN-DUSK ASYMMETRY, RING CURRENT, MAGNETIC-FIELD, TAIL CURRENT, GEOSYNCHRONOUS ORBIT, CURRENT SHEET, MODEL, DST, SPACECRAFT, EVOLUTION",
author = "Pulkkinen, {T. I.} and Ganushkina, {N. Y.} and Tanskanen, {E. I.} and M. Kubyshkina and Reeves, {G. D.} and Thomsen, {M. F.} and Russell, {C. T.} and Singer, {H. J.} and Slavin, {J. A.} and J. Gjerloev",
year = "2006",
month = "9",
day = "28",
doi = "10.1029/2006JA011627",
language = "English",
volume = "111",
journal = "Journal of geophysical research: Space physics",
issn = "2169-9380",
number = "A11",

}

RIS - Download

TY - JOUR

T1 - Magnetospheric current systems during stormtime sawtooth events

AU - Pulkkinen, T. I.

AU - Ganushkina, N. Y.

AU - Tanskanen, E. I.

AU - Kubyshkina, M.

AU - Reeves, G. D.

AU - Thomsen, M. F.

AU - Russell, C. T.

AU - Singer, H. J.

AU - Slavin, J. A.

AU - Gjerloev, J.

PY - 2006/9/28

Y1 - 2006/9/28

N2 - The sawtooth event period embedded in a storm interval on 2001-10-22 is analyzed using magnetic field modeling techniques. The model current systems show that sawtooth injections are associated with strong stretching of both the nightside and dusk-sector magnetic field prior to the injection and a partial disruption of that current at the time of the injection. The currents are strongest near geosynchronous distance and in the premidnight sector. The strong dusk-sector field stretching produces very fast proton drift speeds, which can explain the near-simultaneous occurrence of the injections over a wide local time sector. Comparison of sawtooth periods with nonstorm substorms indicates that the tail field behavior resembles that of nonstorm substorms, but that the consequences of the stretching/dipolarization cycle are different from nonstorm times. As the drifting protons during sawtooth events are mostly on open drift paths, the symmetric ring current is only slightly affected, while large variations are seen in the asymmetric ring current. The three-spacecraft magnetic field measurements together with the Dst index were sufficient to constrain the magnetic field model to give a reasonably accurate global magnetic field representation, as confirmed by an independent test using measurements not used in the fitting. Thus we conclude that the empirical modeling methods can be quite reliable in predicting the large-scale fields when suitable observations are available.

AB - The sawtooth event period embedded in a storm interval on 2001-10-22 is analyzed using magnetic field modeling techniques. The model current systems show that sawtooth injections are associated with strong stretching of both the nightside and dusk-sector magnetic field prior to the injection and a partial disruption of that current at the time of the injection. The currents are strongest near geosynchronous distance and in the premidnight sector. The strong dusk-sector field stretching produces very fast proton drift speeds, which can explain the near-simultaneous occurrence of the injections over a wide local time sector. Comparison of sawtooth periods with nonstorm substorms indicates that the tail field behavior resembles that of nonstorm substorms, but that the consequences of the stretching/dipolarization cycle are different from nonstorm times. As the drifting protons during sawtooth events are mostly on open drift paths, the symmetric ring current is only slightly affected, while large variations are seen in the asymmetric ring current. The three-spacecraft magnetic field measurements together with the Dst index were sufficient to constrain the magnetic field model to give a reasonably accurate global magnetic field representation, as confirmed by an independent test using measurements not used in the fitting. Thus we conclude that the empirical modeling methods can be quite reliable in predicting the large-scale fields when suitable observations are available.

KW - DAWN-DUSK ASYMMETRY

KW - RING CURRENT

KW - MAGNETIC-FIELD

KW - TAIL CURRENT

KW - GEOSYNCHRONOUS ORBIT

KW - CURRENT SHEET

KW - MODEL

KW - DST

KW - SPACECRAFT

KW - EVOLUTION

U2 - 10.1029/2006JA011627

DO - 10.1029/2006JA011627

M3 - Article

VL - 111

JO - Journal of geophysical research: Space physics

JF - Journal of geophysical research: Space physics

SN - 2169-9380

IS - A11

M1 - ARTN A11S17

ER -

ID: 2605849