Auroral streamers and magnetic flux closure

[en] On 7 December 2000 at 2200 UT an auroral streamer was observed to develop above Scandinavia with the IMAGE-FUV global imagers. The ionospheric equivalent current deduced from the MIRACLE-IMAGE Scandinavian ground-based network of magnetometers is typical of a substorm-time streamer. Observations of the proton aurora using the SI12 imager onboard the IMAGE satellite are combined with measurements of the ionospheric convection obtained by the SuperDARN radar network to compute the dayside merging and nightside flux closure rates. On the basis of this and other similar events, it is found that auroral streamers appear during the period of most intense flux closure in the magnetotail, most often shortly after substorm onset. The ionospheric convection velocity, as measured by SuperDARN, appears to be reduced in the vicinity of the streamer, suggesting de-coupling of magnetospheric and ionospheric plasma flows in the region of enhanced ionospheric conductance.

Disciplines :

Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others

Author, co-author :

Hubert, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)

Kauristie, K.

Amm, O.

Milan, S. E.

Grocott, A.

Cowley, S. W. H.

Pulkkinen, T. I.

Language :

English

Title :

Auroral streamers and magnetic flux closure

Publication date :

09 August 2007

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Amer Geophysical Union, Washington, United States - Washington

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 08 June 2010

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Bibliography

Amm, O., and K. Kauristie (2002), Ionospheric signatures of bursty bulk flows, Surv. Geophys., 23, 1.
Amm, O., and A. Viljanen (1999), Ionospheric disturbance magnetic field continuation from the ground to the ionosphere using spherical elementary current systems, Earth Planet. Space, 51, 431.
Amm, O., A. Pajunpää and U. Brandström (1999), Spatial distribution of conductances and currents associated with north-south auroral form during a multiple-substorm period, Ann. Geophys., 17, 1385.
Angelopoulos, V., W. Baumjohann, C. F. Kennel, F. V. Coroniti, M. G. Kivelson, R. Pellat, R. J. Walker, H. Lühr, and G. Paschmann (1992),Bursty bulk flows in the inner central plasmasheet, J. Geophys. Res., 97, 4027.
Chen, C. X., and R. A. Wolf (1993), Interpretation of high-speed flows in the plasma sheet, J. Geophys. Res., 98, 21,409.
Chen, C. X., and R. A. Wolf (1999), Theory of thin-filament motion in Earth's magnetotail and its application to bursty bulk flows, J. Geophys. Res., 104, 14,613.
Coroniti, F. V., and C. F. Kennel (1973), Can the ionosphere regulate magnetospheric convection?, J. Geophys. Res., 78, 2837.
Fairfield, D. H., et al. (1999), Earthward flow bursts in the inner magnetotail and their relation to auroral brightening, AKR intensifications, geosynchronous particle injections and magnetic activity, J. Geophys. Res., 104, 355.
Hubert, B., S. E. Milan, A. Grocott, S. W. H. Cowley, and J.-C. Gérard (2006a), Dayside and nightside reconnection rates inferred from IMAGE-FUV and SuperDARN data, J. Geophys. Res., 111, A03217, doi:10.1029/2005JA011140.
Hubert, B., M. Palmroth, T. V. Laitinen, P. Janhunen, S. E. Milan, A. Grocott, S. W. H. Cowley, T. Pulkkinen, and J.-C. Gérard (2006b), Compression of the Earth's magnetotail by interplanetary shocks directly drives transient magnetic flux closure, Geophys. Res. Lett., 33, L10105, doi:10.1029/2006GL026008.
Kauristie, K., V. A. Sergeev, O. Amm, M. V. Kubyshkina, J. Jussila, E. Donovan, and K. Liou (2003), Bursty bulk flow intrusion to the inner plasma sheet as inferred from auroral observations, J. Geophys. Res., 108(A1), 1040, doi:10.1029/2002JA009371.
Mende, S. B., et al. (2000), Far ultraviolet imaging from the IMAGE spacecraft: 3. Spectral imaging of Lyman alpha and OI 135.6 nm, Space Sci. Rev., 91, 287.
Mersmann, U., W. Baumjohann, F. Küppers, and K. Lange (1979), Analysis of an eastward electrojet by means of upward continuation of ground-based magnetometer data, J. Geophys., 45, 281-298.
Owen, C. J., and S. W. H. Cowley (1987), Simple models of time-dependent reconnection in a collision-free plasma with an application to substorms in the geomagnetic tail, Planet. Space Sci., 35, 451.
Ruohoniemi, J. M., and K. B. Baker (1998), Large scale imaging of high-latitude convection with Super Dual Auroral Radar Network HF radar observations, J. Geophys. Res., 103, 20,797.
Sergeev, V. A., K. Liou, P. T. Newell, S.-I. Otani, M. R. Hairson, and F. Rich (2004), Auroral streamers: Characteristics of associated precipitation, convection and field-aligned currents, Ann. Geophys., 22, 537.
Shiokawa, K., W. Baumjohann, and G. Haerendel (1997), Braking of high-speed flows in the near-Earth tail, Geophys. Res. Lett., 24, 1179.