Plans d'accès
Webmail
Accueil > Recherche > Plasmas Spatiaux > Thématiques scientifiques > Magnetic substorms
Magnetic substorms
Toutes les versions de cet article : [English] [français]
LPP team
Selected publications
- Le Contel O., Nakamura R., Breuillard H., Argall M. R., Graham D. B., Fischer D., Retinò A., Berthomier M., Pottelette R., Mirioni L., Chust T., Wilder F. D., Gershman D. J., Varsani A., Lindqvist P.-A., Khotyaintsev Y. V., Norgren C., Ergun R. E., Goodrich K. A., Burch J. L., Torbert R. B., Needell J., Chutter M., Rau D., Dors I., Russell C. T., Magnes W., Strangeway R. J., Bromund K. R., Wei H. Y., Plaschke F., Anderson B. J., Le G., Moore T. E., Giles B. L., Paterson W. R., Pollock C. J., Dorelli J. C., Avanov L. A., Saito Y., Lavraud B., Fuselier S. A., Mauk B. H., Cohen I. J., Turner D. L., Fennell J. F., Leonard T., Jaynes A. N., Lower Hybrid Drift Waves and Electromagnetic Electron Space-Phase Holes Associated With Dipolarization Fronts and Field-Aligned Currents Observed by the Magnetospheric Multiscale Mission During a Substorm, Journal of Geophysical Research Space Physics 122 (12) 236-257 (2017).
- Tenerani A., O. Le Contel, F. Califano, P. Robert, D. Fontaine, N. Cornilleau-Wehrlin, and J.-A. Sauvaud, Cluster Observations of Whistler Waves Correlated With Ion-Scale Magnetic Structures During the August 17th, 2003 Substorm Event, J. Geophys. Res., 118, 1–18, doi:10.1002/jgra.50562, 2013.
- Roux A., O. Le Contel, D. Fontaine, P. Robert, P. Louarn, et al.. Substorm theories and Cluster multi-point measurements, 5th Anniversary of Cluster in Space, 2006, Noordwijk, Netherlands. Fletcher K., pp.19-23, 2006
Mystery of substorms
The Earth is a strongly magnetized planet. Its magnetic field interacts with the plasma constantly ejected by the Sun (solar wind) in the interplanetary medium. This interaction leads to spectacular phenomena. Some of their effects have implications for human activity.
The Earth’s magnetic field pushes the solar wind at a distance of about ten Earth radii from the planet on the day side, acting as a magnetic shield. The Earth environment, dominated by its intrinsic magnetic field, is called magnetosphere. On the night side of the planet, the magnetosphere stretches for hundreds of Earth radii, forming the so-called magnetotail. This region is the seat of magnetospheric substorm phenomena.
- Aurore boréale à Sodankyla en Finlande
© CNRS Photothèque - Michel HERSE
Substorms cause the acceleration of charged particles toward Earth. The arrival of these particles into the upper atmosphere is at the origin of polar auroras. We can see their nice bright draped from the surface of the Earth. The precipitation of these particles is also causing disruptions of power lines and telecommunication networks. If one observes the effects, little is known about the genesis of the acceleration of charged particles.
Knowing where and when substorms are trigger is at the heart of scientific debate for over thirty years. The first space missions launched to study the origin of magnetospheric substorms were composed of single spacecraft. These phenomena extend in minutes over large distances. These missions are faced with the difficulty of determining their starting point, which could even not be resolved by the first bi-satellite missions as ISEE 1 and 2 (ESA / NASA) (1978-1987). That is why multi satellite missions have been designed, such THEMIS mission (NASA) launched in 2007 with 5 satellites.
Dans la même rubrique :
- Modélisation théorique des plasmas sans collision
- Turbulence
- La reconnexion magnétique
- Accélération, rayonnement et turbulence dans les régions aurorales terrestres
- Les ondes de choc sans collision
- Génération du vent solaire
- Magnétopause de la Terre
- Magnétosphères planétaires
- Modélisation des environnements plasmas des petites planètes
- Météorologie de l’espace
- Sous-orages magnétosphériques
- Activité Solaire
