Magnetospheric field-line resonances: Ground-based observations and modeling
نویسندگان
چکیده
منابع مشابه
Field line resonances in discretized magnetospheric models: an artifact study
For more than two decades numerical models of the Earth's magnetosphere have been used successfully to study magnetospheric dynamic features such as the excitation of ULF pulsations and the mechanism of ®eld line resonance. However, numerical formulations simplify important properties of the real system. For instance the Alfve n continuum becomes discrete because of a ®nite grid size. This dis...
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[1] Several observational studies suggest that solar wind dynamic pressure fluctuations can drive magnetospheric ultralow‐frequency (ULF) waves on the dayside. To investigate this causal relationship, we present results from Lyon‐Fedder‐Mobarry (LFM) global, three‐dimensional magnetohydrodynamic (MHD) simulations of the solar wind–magnetosphere interaction. These simulations are driven with syn...
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Magnetospheric plasma density can be remotely sensed through ground-based magnetometer data using a suitable model for field line resonances (FLRs) formed by standing shear Alfvén wave on closed geomagnetic field lines. The simplest type of FLR model, which is also the most relevant for magnetometer data inversion purposes, is based on solving a certain eigenvalue problem. Over the years a numb...
متن کاملEvidence of transverse magnetospheric field line oscillations as observed from Cluster and ground magnetometers
The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119 000 km, perigee of 19 000 km and the orbital period of 57 h) have been prepared in the frequency range 0 to 120 mHz when the satellite was near its perigee. The existence of field line oscillations, with increasing frequency in the inbound sector and decreas...
متن کاملField line resonances in a cylindrical plasma
An experimental study of the response to an impulsive driver in a low beta helium plasma is presented. Field line resonance ~FLR! spectra are recorded and compared to an ideal magnetohydrodynamic ~MHD! theory with finite ion cyclotron frequency corrections. The agreement between observed and predicted values is generally within the frequency resolution of the measurements except for the lowest ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2005
ISSN: 0148-0227
DOI: 10.1029/2004ja010919