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The periodic variations of a white-light flare observed with ULTRACAM

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  • High Time Resolution Observations Of A White-Light Flare On The Active Star Eq Pegb Show Evidence Of
  • The Period Drifts To Longer Values During The Decay Phase Of The Flare
  • If The Oscillation Is Interpreted As An Impulsively-Excited
  • Standing-Acoustic Wave In A Flare Loop
  • The Period Implies A Loop Length Of Approximate To 3
  • 4 Mm And Approximate To 6
  • 8 Mm For The Case Of The Fundamental Mode And The Second Harmonic
  • Respectively
  • However
  • The Small Loop Lengths Imply A Very High Modulation Depth Making The Acoustic Interpretation Unlikel
  • A More Realistic Interpretation May Be That Of A Fast-Mhd Wave
  • With The Modulation Of The Emission Being Due To The Magnetic Field
  • Alternatively
  • The Variations Could Be Due To A Series Of Reconnection Events
  • The Periodic Signature May Then Arise As A Result Of The Lateral Separation Of Individual Flare Loop
  • E
  • Periodic Reconnection)


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