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Physical conditions of the acceleration region of a solar flare with an unusually narrow gyrosynchrotron spectrum

Published online by Cambridge University Press:  01 August 2006

Guillermo G. Giménez de Castro
Affiliation:
Centro de Rádio Astronomia e Astrofísica Mackenzie, R. da Consolação 896, 01302-907, São Paulo, Brazil email: guigue@craam.mackenzie.br
Joaquim E. Rezende Costa
Affiliation:
Centro de Rádio Astronomia e Astrofísica Mackenzie, R. da Consolação 896, 01302-907, São Paulo, Brazil email: guigue@craam.mackenzie.br
Adriana Válio Roque da Silva
Affiliation:
Centro de Rádio Astronomia e Astrofísica Mackenzie, R. da Consolação 896, 01302-907, São Paulo, Brazil email: guigue@craam.mackenzie.br
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During the rising phase of the August 30, 2002 X1.5 flare a short pulse with a total duration of 8 seconds was observed. Its background-subtracted radio spectrum ranges only from 5 to 12 GHz with a maximum flux density of approximately 900 s.f.u. at 7 GHz and a steep optically thin spectral index α ≃ 8. Maximum degree of polarization at 7 GHz is around 5%. The hard X-ray pulse emission above the background in the range of 30–150 keV observed by RHESSI is coincident in time with the microwave observation. Hard X-ray images reveal very compact (∼ 10″) footpoint sources. Below 30 keV, a thermal source is observed.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Holman, G. D., Kundu, M. R., & Kane, S. R. 1989, ApJ, 345, 1050CrossRefGoogle Scholar