Search Publications
High frequency ion sound waves associated with Langmuir waves in type III radio burst source regions
MacDowall, R. J.; Thejappa, G.
Short wavelength ion sound waves (2-4kHz) are detected in association with the Langmuir waves (~15-30kHz) in the source regions of several local type III radio bursts. They are most probably not due to any resonant wave-wave interactions such as the electrostatic decay instability because their wavelengths are much shorter than those of Langmuir w…
Model for vortex turbulence with discontinuities in the solar wind
Tsurutani, B. T.; Verkhoglyadova, O. P.; Dasgupta, B.
A model of vortex with embedded discontinuities in plasma flow is developed in the framework of ideal MHD in a low b plasma. Vortex structures are considered as a result of 2-D evolution of nonlinear shear Alfvén waves in the heliosphere. Physical properties of the solutions and vector fields are analyzed and the observational aspects of the model…
A study of magnetic fluctuations and their anomalous scaling in the solar wind: the Ulysses fast-latitude scan
Balogh, A.; Pagel, C.
The solar wind is a highly turbulent and intermittent medium at frequencies between 10-4 and 10-1 Hz. Power spectra are used to look at fluctuations in the components of the magnetic field at high frequencies over a wide range of latitudes. Results show steady turbulence in the polar regions of the Sun and a more varied envir…
Energetic particle cross-field diffusion: Interaction with Magnetic Decreases (MDs)
Lakhina, G. S.; Tsurutani, B. T.; Galvan, C. +3 more
Magnetic field Decreases (MDs) are detected in the heliospheric polar regions. The MDs have minimum spatial scales sizes of 25 proton thermal gyroradii, and are typically bounded by tangential or rotational discontinuities. The distribution of the magnitudes of the decreases within AIDs is a continuum, with the smallest decreases being most freque…
Structure function measurements of the intermittent MHD turbulent cascade
Balogh, A.; Horbury, T. S.
The intertmittent nature of turbulence within solar wind plasma has been demonstrated by several studies of spacecraft data. Using magnetic field data taken in high speed flows at high heliographic latitudes by the Ulysses probe, the character of fluctuations within the inertia] range is discussed. Structure functions are used extensively. A simpl…