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Complex Type III bursts: (SA/Complex Type III-like/Type III- l bursts)

Complex Type III bursts: (SA/Complex Type III-like/Type III- l bursts). R. MacDowall M. Kaiser Goddard Space Flight Center. Cane et al., 1982. SA/Complex Type III-like/III- l bursts. Bougeret et al., 1998. Reiner et al., 2000. What’s new (Cane et al., 2002)?.

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Complex Type III bursts: (SA/Complex Type III-like/Type III- l bursts)

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  1. Complex Type III bursts:(SA/Complex Type III-like/Type III-l bursts) R. MacDowall M. Kaiser Goddard Space Flight Center

  2. Cane et al., 1982

  3. SA/Complex Type III-like/III-l bursts

  4. Bougeret et al., 1998

  5. Reiner et al., 2000

  6. What’s new (Cane et al., 2002)? • Type III-lbursts are long duration, extend to low frequencies, and include components that begin late relative to the flare • Type III-l bursts onlyoccur in association with proton acceleration at the Sun • CMEs without type III-l bursts do not produce >20 MeV protons • Type III-ls imply open field lines exist, and consequently, some flare particles will be detected for all major solar particle events

  7. ftp://www.ips.gov.au/data/Solar/Culgoora Observatory/in Historical Data/SEP Related Events/

  8. MacDowall et al., 2003 • Examined Type III-lbursts as part of LWS CDAW • Examined 4 groups of events – SEP-related group and 3 control groups • Given 3 criteria (based on hectometric data only)

  9. What else can be done? • Spectra with low energy electrons suggest acceleration high in the corona -> modeling • Imaging of the type III-lburst components will help to locate the acceleration region • Comprehensive analysis and understanding of the “complex” components may be significant in the overall understanding of III-ls

  10. Lin (1985)

  11. What else can be done? • Spectra with low energy electrons suggest acceleration high in the corona -> modeling • Imaging of the type III-lburst components will help to locate the acceleration region • Comprehensive analysis and understanding of the “complex” components may be significant in the overall understanding of III-ls

  12. Imaging – limb event

  13. What else can be done? • Spectra with low energy electrons suggest acceleration high in the corona -> modeling • Imaging of the type III-lburst components will help to locate the acceleration region • Comprehensive analysis and understanding of the “complex” components may be significant in the overall understanding of III-ls

  14. Summary • Complex type III bursts have attracted attention because of uncertainty about the acceleration source • Imaging may permit association of the complex features with structures in the corona • Analysis of the electron spectra may also be helpful • Because of the association of these events with SEPs and their connections to particle acceleration, they deserve further study

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