Details

Autor(en) / Beteiligte

• Ashour-Abdalla, Maha
• El-Alaoui, Mostafa
• Goldstein, Melvyn L.
• Zhou, Meng
• Schriver, David
• Richard, Robert
• Walker, Raymond
• Kivelson, Margaret G.
• Hwang, Kyoung-Joo

Titel

Observations and simulations of non-local acceleration of electrons in magnetotail magnetic reconnection events

Ist Teil von

• Nature physics, 2011-04, Vol.7 (4), p.360-365

Ort / Verlag

London: Nature Publishing Group UK

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Magnetic reconnection in magnetized plasmas represents a change in magnetic field topology and is associated with a concomitant energization of charged particles that results from a conversion of magnetic energy into particle energy. In Earth’s magnetosphere this process is associated with the entry of the solar wind into the magnetosphere and with the initiation of auroral substorms. Using data from the THEMIS mission, together with global and test particle simulations, we demonstrate that electrons are energized in two distinct regions: a low-energy population (less than or equal to a few kiloelectronvolts) that arises in a diffusion region where particles are demagnetized and the magnetic topology changes, and a high-energy component (approaching 100 keV) that results from betatron acceleration within dipolarization fronts that sweep towards the inner magnetosphere far from the diffusion region. Thus, the observed particle energization is associated with both magnetic reconnection and with betatron acceleration associated with macroscopic flows. Magnetic reconnection has long been implicated in the acceleration of electrons to relativistic speeds in the Earth’s magnetosphere. Satellite observations and simulations indicate it is just part of the story, the rest of which involves a second process known as betatron acceleration.