Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Multiwavelength Analysis of an Active Region

  • 58 Accesses

  • 8 Citations


We study active region NOAA 8541, observed with instruments on board SOHO, as well as with TRACE. The data set mainly covers the transition region and the low corona. In selected loops studied with SUMER on SOHO, the VIII 770 Å line is systematically redshifted. In order to estimate the plasma velocity, we combine the Doppler shifts with proper motions (TRACE) along these loops. In the case of an ejection, apparently caused by the emergence of a parasitic polarity, proper motions and Doppler shifts give consistent results for the velocity. A cooler loop, observed in the same active region with CDS, shows a unidirectional motion reminiscent of a siphon flow. The derived electron temperature and density along a large steady loop confirm that it cannot be described by hydrostatic models.

This is a preview of subscription content, log in to check access.


  1. Arnaud, M. and Rothenflug, J.: 1985, Astron. Astrophys. Suppl. Ser. 60, 425.

  2. Arnaud, M. and Raymond, J.: 1992, Astrophys. J. 398, 394.

  3. Aschwanden, M. J. and Schrijver, C. J.: 2002, Astrophys. J. S. 142, 269.

  4. Aschwanden, M. J., Nightingale, R. W., and Alexander, D.: 2000, Astrophys. J. 541, 1059.

  5. Aschwanden, M. J., Schrijver, C. J., and Alexander, D.: 2001, Astrophys. J. 550, 1036.

  6. Aschwanden, M. J., Newmark, J. S., Delaboudinière, J. P., Neupert, W. M., Klimchuk, J. A., Gary, G. A., Portier-Fozzani, F., and Zucker, A.: 1999, Astrophys. J. 515, 842.

  7. Bray, R. J., Cram, L. E., Durrant, C. J., and Loughhead, R. E.: 1991, Plasma Loops in the Solar Corona, Cambridge Astrophysics Series, Cambridge University Press, Cambridge, Great Britain.

  8. Chae, J., Wang, J. Q., Goode, P. R., and Wilhelm, K.: 2000, Astrophys. J., 533, 535.

  9. Curdt, W., Brekke, P., Feldman, U., Wilhelm K., Dwivedi B. N., Schühle, U., and Lemaire, P.: 2001, Astron. Astrophys. 375, 591.

  10. Dammasch, I. E., Wilhelm, K., Curdt, W., and Hassler, D. M.: 1999, Astron. Astrophys. 346, 285.

  11. Dara, H. C., Gontikakis, C., Zachariadis, Th., Tsiropoula, G., Alissandrakis, C. E., and Vial, J.-C.: 2002, ESA SP-477, 95, in Proceedings of the Second Solar Cycle and Space Weather Euroconference, Vico Equense, Italy, p. 95.

  12. De Jager, C.: 2002, in Bleeker, J. A., Geiss, J., Huber, M. (eds.), The Century of Space Science, Kluwer Academic Publishers, Dordrecht The Netherlands, p. 203.

  13. Delaboudinière, J.-P., Artzner, G. E., Brunaud, J., Gabriel, A. H., Hochedez, J. F., Millier, F. ηl: 1995, Solar Phys. 162, 291.

  14. Del Zanna, G. and Mason, H. E.: 2003, Astron. Astrophys. 406, 1089.

  15. Del Zanna, G., Landini, M., and Mason, H. E.: 2002, Astron. Astrophys. 385, 968.

  16. Dere, K. P., Landi, E., Mason, H. E., Monsignori Fossi, B. C., and Young, P. R.: 1997 Astron. Astrophys. Suppl. Ser. 125, 149.

  17. Foley, C. A.: 1998, Ph.D. thesis, University College, London.

  18. Golub, L., Bookbinder, J., Deluca, E. E., Karovska, M., Warren, H. P., Schrijver, C. J., Shine, R., Tarbell, T., Title, A., Wolfson, J., Handy, B., and Kankelborg, C.: 1999, Phys. Plasmas 6(5), 2205.

  19. Gudiksen, B. and Nordlund, Å.: 2002, Astrophys. J. 572, 113.

  20. Judge, P. G. and McIntosh, S. W.: 2000, Solar Phys. 190, 331.

  21. Landi, E. and Landini, M.: 2004, Astrophys. J. 608, 1133.

  22. Lenz, D. D., DeLuca, E. E., Golub, L., Rosner, R., and Bookbinder, J. A.: 1999, Astrophys. J. 517, 155.

  23. Marsch, E., Wiegelmann, T., and Xia, L. D.: 2004, Astron. Astrophys. 428, 629.

  24. Mazzotta, P., Mazzitelli, G., Colafrancesco, S., and Vittorio, N.: 1998, Astron. Astrophys. Suppl. Ser. 133, 403.

  25. McClymont, A. N. and Craig, I. J. D.: 1987, Astrophys. J. 312, 402.

  26. Peter, H.: 1999, Astrophys. J. 516, 490.

  27. Peter, H., Gudiksen, B., and Nordlund, Å.: 2004, Astrophys. J. 617, 85.

  28. Petrie, G. J., Vlahakis, N., and Tsinganos, K.: 2002, Astron. Astrophys. 382, 1092.

  29. Petrie, G. J., Gontikakis, G., Dara, H. C., Tsinganos, K., and Aschwanden, J. M.: 2003, Astron. Astrophys. 409, 1065.

  30. Priest, E. R., Foley, C. R., Heyvaerts, J., Arber, T. D., Mackay, D., Culhane, J. L., and Acton, L. W.: 2000, Astrophys. J. 539, 1002.

  31. Rosner, R., Tucker, W. H., and Vaiana, G. S.: 1978, Astrophys. J. 220, 643.

  32. Schmelz, J. T., Scopes, R. T., Cirtain, J. W., Winter, H. D., and Allen, J. D.: 2001, Astrophys. J. 556, 896.

  33. Spadaro, D., Antiochos, S. K., and Mariska, J. T.: 1991, Astrophys. J. 382, 338.

  34. Spadaro, D., Lanzafame, A. C., Consoli, L., Marsch, E., Brooks, D. H., and Lang, J.: 2000, Astron. Astrophys. 359, 716.

  35. Teriaca, L. and Wilhelm, K., 2001, Reduction and Analysis of SUMER data, see SUMER webpage:

  36. Teriaca, L., Banerjee, D., and Doyle, J. G.: 1999, Astron. Astrophys. 349, 636.

  37. Thompson, W. T., CDS Software note No 53, available at

  38. Winebarger, A. R. and Warren, H. P.: 2005, Astrophys. J. 626, 543.

  39. Winebarger, A. R., DeLuca, E. E., and Golub, L.: 2001, Astrophys. J. 553, 81.

  40. Winebarger, A. R., Warren, H. P., and Mariska, J. T.: 2003, Astrophys. J. 587, 439.

  41. Winebarger, A. R., Warren, H. P., and Seaton, D. B.: 2003, Astrophys. J. 593, 1164.

  42. Winebarger, A. R., Warren, H. P., van Ballegooijen, A., DeLuca, E. E., and Golub, L.: 2002, Astrophys. J. 567, L89.

  43. Young, P. R., Del Zanna, G., Landi, E., Dere, K. P., Mason, H. E., and Landini, M.: 2003, Astrophys. J. S. 144, 135.

Download references

Author information

Correspondence to C. Gontikakis.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Gontikakis, C., Dara, H.C., Zachariadis, T.G. et al. Multiwavelength Analysis of an Active Region. Sol Phys 233, 57–78 (2006).

Download citation


  • Active Region
  • Transition Region
  • Electron Temperature
  • Doppler Shift
  • Proper Motion