Different magnetospheric modes: solar wind driving and coupling efficiency

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Different magnetospheric modes : solar wind driving and coupling efficiency. / Partamies, N.; Pulkkinen, T. I.; McPherron, R. L.; McWilliams, K.; Bryant, C. R.; Tanskanen, E.; Singer, H. J.; Reeves, G. D.; Thomsen, M. F.

In: Annales Geophysicae, Vol. 27, No. 11, 2009, p. 4281-4291.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Partamies, N, Pulkkinen, TI, McPherron, RL, McWilliams, K, Bryant, CR, Tanskanen, E, Singer, HJ, Reeves, GD & Thomsen, MF 2009, 'Different magnetospheric modes: solar wind driving and coupling efficiency' Annales Geophysicae, vol. 27, no. 11, pp. 4281-4291. https://doi.org/10.5194/angeo-27-4281-2009

APA

Partamies, N., Pulkkinen, T. I., McPherron, R. L., McWilliams, K., Bryant, C. R., Tanskanen, E., ... Thomsen, M. F. (2009). Different magnetospheric modes: solar wind driving and coupling efficiency. Annales Geophysicae, 27(11), 4281-4291. https://doi.org/10.5194/angeo-27-4281-2009

Vancouver

Author

Partamies, N. ; Pulkkinen, T. I. ; McPherron, R. L. ; McWilliams, K. ; Bryant, C. R. ; Tanskanen, E. ; Singer, H. J. ; Reeves, G. D. ; Thomsen, M. F. / Different magnetospheric modes : solar wind driving and coupling efficiency. In: Annales Geophysicae. 2009 ; Vol. 27, No. 11. pp. 4281-4291.

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@article{bdb85def9a554d7e9942603f97206da5,
title = "Different magnetospheric modes: solar wind driving and coupling efficiency",
abstract = "This study describes a systematic statistical comparison of isolated non-storm substorms, steady magnetospheric convection (SMC) intervals and sawtooth events. The number of events is approximately the same in each group and the data are taken from about the same years to avoid biasing by different solar cycle phase. The very same superposed epoch analysis is performed for each event group to show the characteristics of ground-based indices (AL, PCN, PC potential), particle injection at the geostationary orbit and the solar wind and IMF parameters. We show that the monthly occurrence of sawtooth events and isolated non-stormtime substorms closely follows maxima of the geomagnetic activity at (or close to) the equinoxes. The most strongly solar wind driven event type, sawtooth events, is the least efficient in coupling the solar wind energy to the auroral ionosphere, while SMC periods are associated with the highest coupling ratio (AL/EY). Furthermore, solar wind speed seems to play a key role in determining the type of activity in the magnetosphere. Slow solar wind is capable of maintaining steady convection. During fast solar wind streams the magnetosphere responds with loading-unloading cycles, represented by substorms during moderately active conditions and sawtooth events (or other storm-time activations) during geomagnetically active conditions.",
keywords = "Magnetospheric physics, Magnetosphere-ionosphere interactions, Solar wind-magnetosphere interactions, Storms and substorms, HIGH-LATITUDE CONVECTION, SUBSTORM, FIELD, MAGNETOTAIL, IONOSPHERE, SIGNATURE, DYNAMICS, CANOPUS, DRIVEN, REGION",
author = "N. Partamies and Pulkkinen, {T. I.} and McPherron, {R. L.} and K. McWilliams and Bryant, {C. R.} and E. Tanskanen and Singer, {H. J.} and Reeves, {G. D.} and Thomsen, {M. F.}",
year = "2009",
doi = "10.5194/angeo-27-4281-2009",
language = "English",
volume = "27",
pages = "4281--4291",
journal = "Annales Geophysicae",
issn = "0992-7689",
publisher = "Copernicus Gesellschaft mbH",
number = "11",

}

RIS - Download

TY - JOUR

T1 - Different magnetospheric modes

T2 - solar wind driving and coupling efficiency

AU - Partamies, N.

AU - Pulkkinen, T. I.

AU - McPherron, R. L.

AU - McWilliams, K.

AU - Bryant, C. R.

AU - Tanskanen, E.

AU - Singer, H. J.

AU - Reeves, G. D.

AU - Thomsen, M. F.

PY - 2009

Y1 - 2009

N2 - This study describes a systematic statistical comparison of isolated non-storm substorms, steady magnetospheric convection (SMC) intervals and sawtooth events. The number of events is approximately the same in each group and the data are taken from about the same years to avoid biasing by different solar cycle phase. The very same superposed epoch analysis is performed for each event group to show the characteristics of ground-based indices (AL, PCN, PC potential), particle injection at the geostationary orbit and the solar wind and IMF parameters. We show that the monthly occurrence of sawtooth events and isolated non-stormtime substorms closely follows maxima of the geomagnetic activity at (or close to) the equinoxes. The most strongly solar wind driven event type, sawtooth events, is the least efficient in coupling the solar wind energy to the auroral ionosphere, while SMC periods are associated with the highest coupling ratio (AL/EY). Furthermore, solar wind speed seems to play a key role in determining the type of activity in the magnetosphere. Slow solar wind is capable of maintaining steady convection. During fast solar wind streams the magnetosphere responds with loading-unloading cycles, represented by substorms during moderately active conditions and sawtooth events (or other storm-time activations) during geomagnetically active conditions.

AB - This study describes a systematic statistical comparison of isolated non-storm substorms, steady magnetospheric convection (SMC) intervals and sawtooth events. The number of events is approximately the same in each group and the data are taken from about the same years to avoid biasing by different solar cycle phase. The very same superposed epoch analysis is performed for each event group to show the characteristics of ground-based indices (AL, PCN, PC potential), particle injection at the geostationary orbit and the solar wind and IMF parameters. We show that the monthly occurrence of sawtooth events and isolated non-stormtime substorms closely follows maxima of the geomagnetic activity at (or close to) the equinoxes. The most strongly solar wind driven event type, sawtooth events, is the least efficient in coupling the solar wind energy to the auroral ionosphere, while SMC periods are associated with the highest coupling ratio (AL/EY). Furthermore, solar wind speed seems to play a key role in determining the type of activity in the magnetosphere. Slow solar wind is capable of maintaining steady convection. During fast solar wind streams the magnetosphere responds with loading-unloading cycles, represented by substorms during moderately active conditions and sawtooth events (or other storm-time activations) during geomagnetically active conditions.

KW - Magnetospheric physics

KW - Magnetosphere-ionosphere interactions

KW - Solar wind-magnetosphere interactions

KW - Storms and substorms

KW - HIGH-LATITUDE CONVECTION

KW - SUBSTORM

KW - FIELD

KW - MAGNETOTAIL

KW - IONOSPHERE

KW - SIGNATURE

KW - DYNAMICS

KW - CANOPUS

KW - DRIVEN

KW - REGION

U2 - 10.5194/angeo-27-4281-2009

DO - 10.5194/angeo-27-4281-2009

M3 - Article

VL - 27

SP - 4281

EP - 4291

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 11

ER -

ID: 2574471