Abstract
Solar burst emission data at shorter millimetre wavelengths have been based on a few events measured with low sensitivity and relatively poor time resolution1–9. We present here the first high sensitivity and high time-resolution observations taken simultaneously at 90 GHz (λ =3.3 mm) and at 30 GHz (λ = 10 mm). These have identified a unique impulsive burst on 21 May 1984 with fast pulsed emission that was considerably more intense at 90 GHz than at lower frequencies. Hard X-ray time structures at energies above 25 keV were almost identical to the 90 GHz structures to better than 1 s. The structure of the onset of the major 90-GHz burst coincided with the hard X-ray structure to within 128 ms. All 90-GHz major time structures consisted of trains of multiple sub-second pulses with rise times as short as 0.03 s and amplitudes that were large compared with the mean flux. When detectable, the 30-GHz sub-second pulses had smaller relative amplitude and were in phase with the corresponding 90-GHz pulses.
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References
Coates, R. J. Proc. natn Electron. Conf. 13, 1–12 (1957).
Coates, R. J. Proc. IRE 46, 122–126 (1958).
Croom, D. L. & Powell, R. J. Nature 221, 945–947 (1969).
Croom, D. L. Solar Phys. 15, 414–423 (1970).
Cogdell, J. R. Solar Phys. 22, 147–149 (1972).
Feix, G. J. geophys. Res. 75, 211–218 (1970).
Shimabukuro, F. I. Solar Phys. 23, 169–177 (1972).
Akabane, K., Nakajima, H., Ohki, K., Moriyama, F. & Miyaji, T. Solar Phys. 33, 431–437 (1973).
Shimabukuro, F. I. Solar Phys. 15, 424–432 (1970).
Nakajima, H. et al. Publ. astr. Soc. Jap. (in the press).
Kaufmann, P. et al. C. Cult. S. Paulo 36, 664 (1984).
Kaufmann, P., Strauss, F. M., Schaal, R. E. & Laporte, C. Solar Phys. 78, 389–399 (1982).
Orwig, L. E., Frost, K. J. & Dennis, B. R. Solar Phys. 65, 25–37 (1980).
Hertzberg Institute of Astrophysics Solar Activity Rep. May 1984 (NRC, Ottawa, 1984).
Kiplinger, A. L., Dennis, B. R., Emslie, A. G., Frost, K. J. & Orwig, L. E. Astrophys. J. Lett. 265, L99–L104 (1983).
Brenner, N. in Astrophysics. Part C Vol. 12 (ed. Meeks, M. L.) 284–295 (Academic, New York, 1976).
Kaufmann, P., Strauss, F. M., Opher, R. & Laporte, C. Astr. Astrophys. 87, 58–62 (1980).
Kaufmann, P. et al. Solar Phys. 91, 359–376 (1984).
Takakura, T. et al. Nature 302, 317–319 (1983).
Cornell, M. E., Hurford, G. J., Kiplinger, A. L. & Dennis, B. R. Astrophys. J. 279, 875–881 (1984).
Takakura, T., Uchida, Y. & Kai, K. Solar Phys. 4, 45–57 (1968).
Dulk, G. A. & Marsh, K. A. Astrophys. J. 259, 350–358 (1982).
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Kaufmann, P., Correia, E., Costa, J. et al. Solar burst with millimetre-wave emission at high frequency only. Nature 313, 380–382 (1985). https://doi.org/10.1038/313380a0
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DOI: https://doi.org/10.1038/313380a0
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