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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

Radio bursts and CME’s

Monique Pick

RHESSI workshop 5-8 April 2006

slide2

17 March 2002

Y. Yan, M. Pick, M. Wang, S. Krucker, A. Vourlidas

RHESSI

NRH

OSRA

DAM

WAVES

slide3

17 March 2002 Event A

  • AR 9871
  • 4 NRH frequencies
  • X 164 MHz, 236 MHz
  • West more bursty
  • Type III > 164 MHz
slide4

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

slide5

17 March 2002 Event B

Continuum

O

236 MHz

Cadence 1s 600 km/s

Type III’s

slide8

17 March 2002 Event A

Potential magnetic field extrapolation

(Yan, 2005)

slide9

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
slide11

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

slide13

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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