A statistical study of the compressible energy cascade rate in solar wind turbulence: Parker solar probe observations

Small scale energy cascade of the solar wind turbulence

Magnetic fluctuations in the solar wind are distributed according to Kolmogorov’s power law f below the ion cyclotron frequency fci. Above this frequency, the observed steeper power law is usually interpreted in two different ways: a dissipative range of the solar wind turbulence or another turbulent cascade, the nature of which is still an open question. Using the Cluster magnetic data we show...

Observations of Evolving Turbulence in the Polar Solar Wind

The Ulysses magnetic field experiment has measured the heliospheric magnetic field in solar wind flows from the Sun’s Southern polar coronal hole ovef a wide range of heliolatitudes and distances. We present an anatysis of more than one ym of data, covering a latitude range of 40° to 80°S and a distance range of 4.0 to 1.7 AU. We extend an earlier analysis of Utysses magnetic field data and, by...

Anisotropic third-moment estimates of the energy cascade in solar wind turbulence using multispacecraft data.

The first direct determination of the inertial range energy cascade rate, using an anisotropic form of Yaglom's law for magnetohydrodynamic turbulence, is obtained in the solar wind with multispacecraft measurements. The two-point mixed third-order structure functions of Elsässer fluctuations are integrated over a sphere in magnetic field-aligned coordinates, and the result is consistent with a...

Residual energy in MHD turbulence and in the solar wind

Recent progress in astrophysical plasma turbulence from solar wind observations

This paper summarises some of the recent progress that has been made in understanding astrophysical plasma turbulence in the solar wind, from in situ spacecraft observations. At large scales, where the turbulence is predominantly Alfvénic, measurements of critical balance, residual energy and three-dimensional structure are discussed, along with comparison to recent models of strong Alfvénic tu...