Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

Solar burst with millimetre-wave emission at high frequency only


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.

This is a preview of subscription content, access via your institution

Access options

Rent or buy this article

Prices vary by article type



Prices may be subject to local taxes which are calculated during checkout


  1. Coates, R. J. Proc. natn Electron. Conf. 13, 1–12 (1957).

    Google Scholar 

  2. Coates, R. J. Proc. IRE 46, 122–126 (1958).

    Article  Google Scholar 

  3. Croom, D. L. & Powell, R. J. Nature 221, 945–947 (1969).

    Article  ADS  Google Scholar 

  4. Croom, D. L. Solar Phys. 15, 414–423 (1970).

    Article  ADS  Google Scholar 

  5. Cogdell, J. R. Solar Phys. 22, 147–149 (1972).

    Article  ADS  Google Scholar 

  6. Feix, G. J. geophys. Res. 75, 211–218 (1970).

    Article  ADS  Google Scholar 

  7. Shimabukuro, F. I. Solar Phys. 23, 169–177 (1972).

    Article  ADS  Google Scholar 

  8. Akabane, K., Nakajima, H., Ohki, K., Moriyama, F. & Miyaji, T. Solar Phys. 33, 431–437 (1973).

    ADS  CAS  Google Scholar 

  9. Shimabukuro, F. I. Solar Phys. 15, 424–432 (1970).

    Article  ADS  Google Scholar 

  10. Nakajima, H. et al. Publ. astr. Soc. Jap. (in the press).

  11. Kaufmann, P. et al. C. Cult. S. Paulo 36, 664 (1984).

    Google Scholar 

  12. Kaufmann, P., Strauss, F. M., Schaal, R. E. & Laporte, C. Solar Phys. 78, 389–399 (1982).

    Article  ADS  Google Scholar 

  13. Orwig, L. E., Frost, K. J. & Dennis, B. R. Solar Phys. 65, 25–37 (1980).

    Article  ADS  CAS  Google Scholar 

  14. Hertzberg Institute of Astrophysics Solar Activity Rep. May 1984 (NRC, Ottawa, 1984).

  15. Kiplinger, A. L., Dennis, B. R., Emslie, A. G., Frost, K. J. & Orwig, L. E. Astrophys. J. Lett. 265, L99–L104 (1983).

    Article  ADS  Google Scholar 

  16. Brenner, N. in Astrophysics. Part C Vol. 12 (ed. Meeks, M. L.) 284–295 (Academic, New York, 1976).

    Google Scholar 

  17. Kaufmann, P., Strauss, F. M., Opher, R. & Laporte, C. Astr. Astrophys. 87, 58–62 (1980).

    ADS  Google Scholar 

  18. Kaufmann, P. et al. Solar Phys. 91, 359–376 (1984).

    Article  ADS  Google Scholar 

  19. Takakura, T. et al. Nature 302, 317–319 (1983).

    Article  ADS  Google Scholar 

  20. Cornell, M. E., Hurford, G. J., Kiplinger, A. L. & Dennis, B. R. Astrophys. J. 279, 875–881 (1984).

    Article  ADS  CAS  Google Scholar 

  21. Takakura, T., Uchida, Y. & Kai, K. Solar Phys. 4, 45–57 (1968).

    Article  ADS  Google Scholar 

  22. Dulk, G. A. & Marsh, K. A. Astrophys. J. 259, 350–358 (1982).

    Article  ADS  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations


Rights and permissions

Reprints and permissions

About this article

Cite this article

Kaufmann, P., Correia, E., Costa, J. et al. Solar burst with millimetre-wave emission at high frequency only. Nature 313, 380–382 (1985).

Download citation

  • Received:

  • Accepted:

  • Issue Date:

  • DOI:

This article is cited by


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing