Suppression of resonant field line oscillations by a turbulent background |
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| Institution: | 1. Department of Mathematics, Augsburg College, Campus Box 41, 2211 Riverside Ave, Minneapolis, MN 55454, USA;2. Institute of the Physics of the Earth, Moscow, Russia, and Augsburg College, 2211 Riverside Ave, Minneapolis, MN 55454, USA;3. Department of Physics, Augsburg College, 2211 Riverside Ave, Minneapolis, MN 55454, USA;1. University of California, Los Angeles, USA;2. The Johns Hopkins University, Laurel, USA;3. Dartmouth College, Hanover, USA;4. University of Minnesota, Minneapolis, USA;1. Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, India;2. Dr. K. S. Krishnan Geomagnetic Research Laboratory, IIG, Near Chaman Ganj, Jhunsi, Allahabad 221505, India |
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| Abstract: | Stochastic fluctuations of the magnetospheric plasma and background magnetic field, especially intense during geomagnetically active periods, can provide an additional mechanism of damping of Alfvén field line oscillations. To quantify this hypothesis, we consider a driven Alfvén field line resonator with stochastic fluctuations of the Alfvén resonant frequency. This problem is first considered analytically for a low level of fluctuations, then a more general numerical approach is introduced. The results of analytical calculations and numerical modeling both indicate the deterioration of resonant properties of the resonator owing to stochastic background fluctuations. |
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