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BEGIN:VEVENT
DTSTAMP:20260428T003051Z
DTSTART;VALUE=DATE-TIME:20160425T150000
DTEND;VALUE=DATE-TIME:20160425T160000
SUMMARY:Chloe Pugh & Petra Kohutova
TZID:Europe/London
UID:20160425-094d4345532c7a8e015337f31e856032@warwick.ac.uk
CREATED:20160302T152953Z
DESCRIPTION:2nd Year PhD student seminars Chloe Pugh: 'Kepler Observation
 s of Quasi-periodic Pulsations in Stellar Flares' Abstract: Quasi-period
 ic pulsations (QPPs) in solar flares have been widely observed\, and can
  be used as a coronal plasma diagnostics tool. More recently\, QPPs have
  been observed in flares of other stars\, many of which are thousands of
  times more powerful than anything observed on the Sun. Stellar flares h
 ave been identified in the short-cadence light curves of over 200 Kepler
  stars\, and examined for evidence of QPPs. Those showing evidence of pu
 lsations have been analysed using the autocorrelation and wavelet techni
 ques. QPP-like signatures have been detected in 56 flares\, and of these
  11 have clear damped oscillations which could be modelled. A statistica
 l analysis suggests that the QPPs found in these stellar flares are cons
 istent with those found in solar flares. Petra Kohutova: 'Magnetohydrody
 namic oscillations in solar coronal rain' Abstract: Coronal rain compose
 d of cool plasma condensations falling from coronal heights is a phenome
 non occurring in active region coronal loops as a result of thermal inst
 ability. Recent high resolution observations have shown that coronal rai
 n is much more common than previously thought\, suggesting its important
  role in the chromosphere-corona mass cycle. I address the observational
  evidence for the thermal instability in a coronal loop using observed e
 volution of the emission intensities in several SDO/AIA channels. The ev
 olution of the temperature and density of the coronal loop plasma is rec
 overed using inversion methods and forward modelling and suggests the co
 ronal loop is going through a sequence of periodically repeating heating
 -condensation cycles. I further present the analysis of MHD oscillations
  and kinematics of the coronal rain using coordinated observations by IR
 IS\, Hinode/SOT and SDO/AIA. The plasma condensations are found to move 
 with accelerations largely below the free fall rate\, with the likely re
 asons being pressure effects and the ponderomotive force resulting from 
 the oscillations of the loop. The effect of both factors is investigated
  using LARE2D MHD simulations.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20160411T100932Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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