Bibliographic Details
| Title: |
Magnetosphere Sawtooth Oscillations Induced by Ionospheric Outflow. |
| Authors: |
Brambles, O. J., Lotko, W., Zhang, B., Wiltberger, M., Lyon, J., Strangeway, R. J. |
| Source: |
Science (pre-March 2025). 6/3/2011, Vol. 332 Issue 6034, p1183-1186. 4p. |
| Subjects: |
Magnetosphere, Magnetospheric physics, Oscillations, Ionospheric research, Solar wind, Magnetic fields, Convection (Astrophysics) |
| Abstract: |
The sawtooth mode of convection of Earth's magnetosphere is a 2- to 4-hour planetary-scale oscillation powered by the solar wind-magnetosphere-ionosphere (SW-M-I) interaction. Using global simulations of geospace, we have shown that ionospheric O+ outflows can generate sawtooth oscillations. As the outflowing ions fill the inner magnetosphere, their pressure distends the nightside magnetic field. When the outflow fluence exceeds a threshold, magnetic field tension cannot confine the accumulating fluid; an O+-rich plasmoid is ejected, and the field dipolarizes. Below the threshold, the magnetosphere undergoes quasi-steady convection. Repetition and the sawtooth period are controlled by the strength of the SW-M-I interaction, which regulates the outflow fluence. [ABSTRACT FROM AUTHOR] |
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| Database: |
Psychology and Behavioral Sciences Collection |
