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BEGIN:VEVENT
DTSTAMP:20260428T062905Z
DTSTART;VALUE=DATE-TIME:20211122T150000
DTEND;VALUE=DATE-TIME:20211122T160000
SUMMARY:Owen Roberts (Space Research Institute\, Graz): Sub-ion scale pla
 sma turbulence in the solar wind and the saturation of intermittency
TZID:Europe/London
UID:20211122-8a17841a7c55539a017c7e649c067bfb@warwick.ac.uk
CREATED:20211115T101300Z
DESCRIPTION:Abstract: Measurements of magnetic field and density in the s
 olar wind show disordered fluctuations over a large range of scales. Flu
 ctuations\, at large scales (much larger than the ion gryo/inertial leng
 th)\, are often observed to have Gaussian statistics but develop heavier
  tails increasing their kurtosis as the scale decreases. The non-Gaussia
 n fluctuations are characteristic of coherent structures e.g. current sh
 eets/magnetic vortices and are often associated with temperature increas
 es\, and could be sites for the dissipation of energy. In the sub ion ra
 nge (below the ion inertial/gyro lengths) the nature of the fluctuations
  is less clear. In this range measurements are challenging due to the re
 quirements for high sensitivity and time resolution. For magnetic field 
 measurements at one astronomical unit\, the most sensitive magnetometer 
 f>1 Hz is the Cluster Search coil magnetometer. For density measurements
 \, high time resolution data can be obtained by calibrating spacecraft p
 otential data with a sampling rate of 8kHz available from the magnetosph
 eric multiscale mission. The multiple spacecraft of the Cluster and MMS 
 missions also allow fluctuations to be calculated using a time lag (sing
 le spacecraft) and spatial lags (pairs of spacecraft) allowing the aniso
 tropy of fluctuations to be investigated. The evolution of the scale-dep
 endent fluctuations from inertial scales to sub ion scales shows an incr
 ease at large scales and a flattening and a plateau at sub ion scales. D
 ifferences are also seen between time lags (Taylor shifted to a spatial 
 scale)\, and spatial lags are also observed indicating the anisotropy of
  the fluctuations.
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20211115T101300Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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