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VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Fluids & Plasma Physics Seminar - Sujan Gautam - MOVED TO APRI
 L 16 AT 3:30
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260513T221252Z
UID:tag:localist.com\,2008:EventInstance_52613688119104
DTSTART:20260416T193000Z
DTEND:20260416T203000Z
DESCRIPTION:"Evolution of Turbulence at an Interplanetary Shock Observed by
  the Solar Orbiter and Wind Spacecraft"\n\n \n\nPresented by Sujan Gautam\
 , Graduate Research Assistant\, from the University of Alabama\, Huntsvill
 e\n\n \n\nThis work presents a case study of the evolution of turbulence a
 cross an interplanetary shock observed by Solar Orbiter at 0.83 au and Win
 d at 1 au on 30 November 2023. Turbulence properties\, including total tur
 bulent energy\, correlation length\, cascade rate\, normalized cross helic
 ity\, residual energy\, magnetic helicity\, magnetic compressibility\, and
  spectral characteristics\, are estimated upstream and downstream of the s
 hock at both locations using in situ magnetic field and plasma measurement
 s. These quantities exhibit substantial changes across the shock and evolv
 e with heliocentric distance\, reflecting both shock-driven amplification 
 and radial transport effects. The Linear Mode Decomposition technique is a
 pplied to separate the fluctuations into individual magnetohydrodynamic wa
 ve modes and to investigate the modal composition of the turbulence. Speci
 fically\, six propagating wave modes (forward and backward fast\, slow\, a
 nd Alfvén modes) and two non-propagating advected structures (entropy and
  magnetic island modes) are identified. All decomposed modes show signific
 ant downstream enhancement\, although the amplification rates vary among c
 omponents\, and the overall fluctuation level decreases from Solar Orbiter
  to Wind. The cascade rates contributed by different propagating wave mode
 s are also estimated. The turbulent cascade rate is dominated by fast-mode
  fluctuations upstream\, while Alfvénic contributions become more importa
 nt downstream. The turbulence also exhibits enhanced two-dimensional (2D) 
 dominance in the downstream region of both spacecraft. These results provi
 de new observational insight into the radial evolution of shock-driven tur
 bulence and demonstrate that interplanetary shocks not only amplify turbul
 ence but also systematically reorganize its modal composition\, anisotropy
 \, and cascade properties as they propagate through the heliosphere.
GEO:39.681038;-75.752869
LOCATION:Sharp Lab\, 215
SUMMARY:Fluids & Plasma Physics Seminar - Sujan Gautam - MOVED TO APRIL 16 
 AT 3:30
URL;VALUE=URI:https://events.udel.edu/event/fluids-plasma-physics-seminar-s
 ujan-gautman
CATEGORIES:Academics
CATEGORIES:Faculty & Staff
CATEGORIES:Grad Students & Postdocs
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