Hostname: page-component-7dd5485656-7jgsp Total loading time: 0 Render date: 2025-10-31T08:05:24.038Z Has data issue: false hasContentIssue false
  • English
  • Français

A correlation between Balmer and soft X-ray emission from stellar and solar flares

Published online by Cambridge University Press:  27 September 2017

C.J. Butler ,
M. Rodono  and
B.H. Foing
C.J. Butler
Affiliation:
Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland
M. Rodono
Affiliation:
Instituto di Astronomia, Universita di Catania and Osservatorio Astrofisico, I-95125, Catania, Italy
B.H. Foing
Affiliation:
Centre National de la Recherche Scicntifique, Institut d'Astrophysique Spatiale, B.P. 10, 91371 Verriers le Buisson, France

Summary

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Simultaneous optical spectroscopy and X-ray monitoring of stellar and solar flares shows that a well-defined linear correlation exists between the integrated Hγ and soft X-ray flux that extends over four orders of magnitude. The existence of this relationship implies a direct proportionality between the emission from the cooler and denser regions (T ≈ 104 K) responsible for Balmer lines and the emission from the hot plasma (T ≈ 107 K) responsible for soft X-rays. The consequences are considered for (a) several models which have been proposed for solar flares, and (b) the suggestion that the Balmer emission results from irradiation by soft X-rays.

Information

Type
Session I: Stellar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 21 - 25
Copyright
Copyright © Kluwer 1989

References

Acton, L.W., Canfield, R.C., Gunkler, T.A., Hudson, H.S., Kiplinger, A.L. and Liebacher, J.W.: 1982, As trophys. J. 263, 409 Google Scholar
Butler, C.J. and Rodono, M.: 1985, Irish Astr. J. 17, 131 Google Scholar
Butler, C.J., Rodono, M. Foing, B.H. and Haisch, B.M.: 1980, Nature 321, 679 CrossRefGoogle Scholar
Collura, A., Pasquini, L. and Schmidt, J.H.M.M.: 1988, Astron. and Asroyhys. (in press) Google Scholar
Cram, L.E.: 1982, Astrophys. J. 253, 768 CrossRefGoogle Scholar
de Jager, C.: 1985, Solar Phys. 98, 267 Google Scholar
de Jager, C.: 1987, ibid 110, 337 CrossRefGoogle Scholar
Doyle, J.G., Butler, C.J., Callanan, P.J., Tagliaferri, G., de la Reza, R., White, N.E., Torres, C.A. and Quast, C.: 1988a, Astron. and Astrophys. 191, 79 Google Scholar
Doyle, J.G., Butler, C.J., Byrne, P.B. and Van den Oord, G.H.J.: 1988b, Astron. and Astrophys. 193, 229 Google Scholar
Drake, S.A. and Ulrich, R.K.: 1980, Astrophys. J. Suppl 42, 351 Google Scholar
Gershberg, R.E.: 1973, Soviet Astrophys. 6, 92 Google Scholar
Haisch, B.M., Butler, C.J., Doyle, J.G. and Rodono, M.: 1987, Astron. and Astrophys. 181, 96 Google Scholar
Kahler, S. et al.: 1982, Astrophys. J. 252, 239 Google Scholar
Lin, R.P., Schwartz, R.A., Kane, S.R., Pelling, R.M. and Hurley.K.C.: 1984, Astrophys. J. 328, 421 Google Scholar
McCabe, M.K.: 1973, Solar Phys. 30, 439 CrossRefGoogle Scholar
Mewe, R., Gronenschild, E.H.B.M. and Van den Oord, G.H.J.: 1985, Astron. and Astrophys. Suppl. 62, 197 Google Scholar
Pallavicini, R., Monsignor-Fossi, B.C. and Landini, M.: 1986, ‘Cool Stars Stellar Systems and the Sun’ proc. 4th Cambridge Cool Star Workshop, Santa Fe, 1985, Springer-Verlag, p 212 Google Scholar
Pallavicini, R., Monsignor-Fossi, B.C., Landini, M. and Schmidt, J.H.M.M.: 1988, Astron. and Astrophys. 191, 109 Google Scholar
Priest, E.R.: 1981, ‘Solar Flare Magnetohydrodynamics’ Gordon and Breach (pubs) Google Scholar
Zirm, H.: 1978, Solar Phys. 58, 95 Google Scholar
Zirin, H., Leggett, M. and Patterson, A.: 1982, Solar Phys. 76, 382 CrossRefGoogle Scholar