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Radio bursts and CME’s

Radio bursts and CME’s. Monique Pick RHESSI workshop 5-8 April 2006. 17 March 2002 Y. Yan, M. Pick, M. Wang, S. Krucker, A. Vourlidas. RHESSI. NRH. OSRA. DAM. WAVES. 17 March 2002 Event A. AR 9871 4 NRH frequencies X 164 MHz, 236 MHz West more bursty Type III > 164 MHz.

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Radio bursts and CME’s

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  1. Radio bursts and CME’s Monique Pick RHESSI workshop 5-8 April 2006

  2. 17 March 2002 Y. Yan, M. Pick, M. Wang, S. Krucker, A. Vourlidas RHESSI NRH OSRA DAM WAVES

  3. 17 March 2002 Event A • AR 9871 • 4 NRH frequencies • X 164 MHz, 236 MHz • West more bursty • Type III > 164 MHz

  4. 17 March 2002 Event B RHESSI HXR West source + polarity East and middle sources mixed polarity SXR Outline 2 adjacent loops 3 HXR sources at foot points

  5. 17 March 2002 Event B Continuum O 236 MHz Cadence 1s 600 km/s Type III’s

  6. 17 March 2002 Event B Continuum

  7. 17 March 2002 Event A Potential magnetic field extrapolation (Yan, 2005)

  8. 17 March 2002 Event B • AR 9871 inside old remnant region • Inclusion of small interacting loops • CME above large extrapolated S loops HXR and Radio: Temporal relationship Sprangle &Vlahos, 1993 EM excited by unstable electron distribution inside the flaring loop and excite electrons along Open fields. • HXR • West source + polarity • East and middle sources mixed polarity • SXR • Outline 2 adjacent loops « W » shape

  9. 17 March 2002 Event B HXR and Type III same electron population • Small loops emerge(1 or 2) interact with surrounding open field lines • HXR produced by electrons propagating downward • Outward electron beams propagate in the interface region • between the ascending CME and the neighboring open field lines • Development of CME this region becomes highly compressed • TypeIII 2fp starting and ending altitudes at each frequency • Apparent motions of type III bursts increase in density 10 (4 at 164 MHz) Newkirk model

  10. 164 MHz • Electrons trace the expansion of • the arch system(~2500 km/sec) • Coronal wave develops along • flank of CME In lateral expansion

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