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The Physics of Solar Flares Examining Solar Flares and Radio Bursts By Caylin Mendelowitz and Claire Rosen.

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Presentation on theme: "The Physics of Solar Flares Examining Solar Flares and Radio Bursts By Caylin Mendelowitz and Claire Rosen."— Presentation transcript:

1 The Physics of Solar Flares Examining Solar Flares and Radio Bursts By Caylin Mendelowitz and Claire Rosen

2 OUTLINE Flares Bursts Solar Activity Energy Storage Energy Release Energy Requirements Flare Prediction Summary

3 Solar Interior Solar interior Gregory, p. 202

4 Solar Flares What are they? Radiation –optical (H  ) –radio Phases –activation –impulsive –late

5 Radio Bursts Different Types –type I : thermal –type II & IV: plasma oscillations (shock) & synchrotron –type III & V: plasma oscillations (electrons) & synchrotron Association with flare phases –type III & V coincide with impulsive phase –type II & IV follow impulsive phase –type I in late phase (storm phase)

6 Solar Activity 22 year cycle Signs of solar activity –flares, CME’s, filaments, sunspots Solar magnetic field –frozen field lines –differential rotation --> twisted magnetic field lines –convection --> kinks –buoyancy -->loops (connect sunspots) Gregory, p.221

7 Energy Storage Open field lines B|| (above) – B|| (below) =  0 K, where  0 is the permeability of free space and K is surface current density Figure 4 Gregory, p.220

8 Carroll, p. 424 Field Loop with Current Sheet

9 Energy Release Accelerated particles –excite plasma oscillations --> type III bursts –synchrotron radiation-- type IV and V bursts –heat plasma --> H  double ribbons X-ray or H  loop prominence loop expands as CME -shock excites plasma oscillations --> type II bursts Tandberg-Hanssen and Emslie, cover

10 Energy Requirements Typical field strength of active region B = 300 G. Flare energy is ergs Magnetic energy density is = B 2 /8  = 3580 ergs/cm 3 W = P  dV = PV. Solving for V we get V = W/P and –so the minimum volume needed to contain the energy is V = 2.79 * cm 3 Approximate to cube, so L = 3*10 9 cm Length of H  ribbon is cm -- Physical dimensions compare Reconnection time –  R = ½ (R m ) 1/4  A 1/2  D 1/2 = 3sec Time scale compares

11 Flare Prediction Coronal Mass Ejections (CME’s) Sigmoid regions Zeeman effect Magnetograph Dooling, p. 2

12 Summary Flares (general) - cause? –Origins --> magnetic energy storage –Mechanism --> reconnection Correlation between radio and optical emission –thermal emission --> H  ribbon (optical) –plasma oscillations and synchrotron --> radio waves Prediction


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