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Some Characteristics of Ultra-Fast Time Structures Superimposed on Impulsive mm-Wave Bursts

Published online by Cambridge University Press:  14 August 2015

P. Kaufmann
Affiliation:
CRAAM**/ON/CNPq - R. Pará 277, 01243 - São Paulo, Brazil
F. M. Strauss
Affiliation:
CRAAM**/ON/CNPq - R. Pará 277, 01243 - São Paulo, Brazil
R. Opher
Affiliation:
CRAAM**/ON/CNPq - R. Pará 277, 01243 - São Paulo, Brazil

Summary

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The use of increased sensitivity and temporal resolution at mm-wavelengths has revealed a number of novel features associated with solar activity (Kaufmann et al., 1979a). Of particular interest are the ultra-fast time structures superimposed on impulsive bursts. They are distinguished by time scales and repetition rates much shorter than the impulsive times scales. For weak bursts at λ = 13mm (i.e., few s.f.u.) the superimposed spikes are separated in time by several seconds. For moderate fluxes (i.e., 100 s.f.u.) the repetition rate of superimposed spikes is ~ 10–15 per second (i.e., time interval between two repeated spikes ~ 80 msec). For bursts larger than 500 s.f.u. the predicted times between repeated ultra-fast structures are shorter than 10 msec. Various examples have been studied with a time resolution better than 10 msec. (Kaufmann et al., 1979b). The impulsive flux level increases with the repetition rate of the ultra-fast component, following a nearly linear relationship. The simplest interpretation suggests that the injected spikes are associated with the bursting source function and are quasi-quantized in energy (Kaufmann et al., 1979b).

Type
Session III - Solar Bursts - cm Wavelengths
Copyright
Copyright © Reidel 1980 

References

Kaufmann, P., Strauss, F.M., Raffaelli, J.C. and Opher, R.: 1979a, Solar-Terrestrial Predictions Proc., in press.Google Scholar
Kaufmann, P., Strauss, F.M. Opher, R., and Laporte, C.: 1979b, Astron. Astrophys., in press.Google Scholar
Kaufmann, P., Rizzo Piazza, L., and Raffaelli, J.C.: 1977, Solar Phys. 54, 179.CrossRefGoogle Scholar
Thomas, R.J. and Neupert, W.M.: 1978, AAS Workshop on Flare Research and Solar Maximum Mission, Ann Arbor, Michigan, USA, 14–16 November.Google Scholar