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BEGIN:VEVENT
DTSTAMP:20260428T014710Z
DTSTART;VALUE=DATE-TIME:20201102T130000
DTEND;VALUE=DATE-TIME:20201102T140000
SUMMARY:Nikolai Tsyganenko (University of St Petersburg): Storm-time evol
 ution of the magnetosphere as inferred from dynamical data mining and mo
 dern modeling methods
TZID:Europe/London
UID:20201102-8a17841b7520fbc0017530418eee6109@warwick.ac.uk
CREATED:20201016T071324Z
DESCRIPTION:Abstract: Unlike computer simulations\, based entirely on fir
 st-principle equations\, the empirical models seek to reconstruct the re
 al-world magnetosphere from direct in situ observations and\, in that se
 nse\, can be viewed as the "ground truth" of the data. In this talk\, we
  present and discuss first results of modeling the storm-time evolution 
 of the magnetosphere\, based on a synthesis of (i) a new method to repre
 sent the magnetic field by means of the so-called cylindrical basis func
 tions (CBF)\, (ii) the dynamical "nearest-neighbour" data mining in the 
 state parameter space\, and (iii) a large pool of archived multi-mission
  spacecraft data for the period 1995--2019\, complemented with concurren
 t ground disturbance indices. The modeling reveals main features of the 
 geomagnetic field reconfiguration in terms of its depression/compression
  and extremely variable field line stretching. The initial contraction o
 f the dayside magnetosphere due to the interplanetary shock arrival is a
 ccompanied with a local transient surge of the inner tail current and a 
 dramatic antisunward discharge of the magnetic flux. As the storm progre
 sses\, the ring current buildup results in a progressively depressed mag
 netic field in the inner magnetosphere and the magnetic flux transfer to
  more distant tail plasma sheet. At the same time\, a strong dawn-dusk a
 symmetry is developed due to the formation of the duskside partial ring 
 current\, in agreement with previous independent results.
LOCATION:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20201016T071324Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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