Advertisement

Tomographic 3D-Modeling of the Solar Corona with FASR

  • Markus J. Aschwanden
  • David Alexander
  • Marc L. De Rosa
Part of the Astrophysics and Space Science Library book series (ASSL, volume 314)

Abstract

The Frequency-Agile Solar Radiotelescope (FASR) literally opens up a new dimension, in addition to the 3D Euclidian geometry—the frequency dimension. The 3D geometry is degenerated to 2D in all images from astronomical telescopes, but the additional frequency dimension allows us to retrieve the missing third dimension by means of physical modeling. We call this type of 3D reconstruction Frequency Tomography. In this study we simulate a realistic 3D model of an active region, composed of 500 coronal loops with the 3D geometry [x(s), y(s), z(s)] constrained by magnetic field extrapolations and the physical parameters of the density n e (s) and temperature T e (s) given by hydrostatic solutions. We simulate a series of 20 radio images in a frequency range of ν=0.1–10 GHz, anticipating the capabilities of FASR, and investigate what physical information can be retrieved from such a dataset. We discuss also forward-modeling of the chromospheric and Quiet Sun density and temperature structure, another primary goal of future FASR science.

Keywords

Sun: corona Sun: chromosphere Sun: radio 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Altschuler, M. D. 1979, in Image Reconstruction from Projections, (ed. G. T. Herman, Berlin: Springer), p. 105Google Scholar
  2. Aschwanden, M. J. & Bastian, T. S. 1994a, ApJ, 426, 425ADSCrossRefGoogle Scholar
  3. Aschwanden, M. J. & Bastian, T. S. 1994b, ApJ, 426, 434ADSCrossRefGoogle Scholar
  4. Aschwanden, M. J., Lim, J., Gary, D. E., & Klimchuk, J. A. 1995, ApJ, 454, 512CrossRefADSGoogle Scholar
  5. Aschwanden, M. J., Newmark, J. S., Delaboudiniere, J. P., Neupert, W. M., Klimchuk, J. A., Gary, G. A., Portier-Fornazzi, F., & Zucker, A. 1999, ApJ, 515, 842CrossRefADSGoogle Scholar
  6. Aschwanden, M. J., Alexander, D., Hurlburt, N., Newmark, J. S., Neupert, W. M., Klimchuk, J. A., & G. A. Gary 2000a, ApJ, 531, 1129CrossRefADSGoogle Scholar
  7. Aschwanden, M. J., Nightingale, R. W., & Alexander, D. 2000b, ApJ, 541, 1059CrossRefADSGoogle Scholar
  8. Aschwanden, M. J. & Schrijver, K. J. 2002, ApJ Supp., 142, 269ADSCrossRefGoogle Scholar
  9. Aschwanden, M. J., Brown, J. C., & Kontar, E. P. 2002, Solar Phys, 210, 383ADSCrossRefGoogle Scholar
  10. Bastian, T. S. 1994, ApJ, 426, 774CrossRefADSGoogle Scholar
  11. Bastian, T. S. 1995, ApJ, 439, 494CrossRefADSGoogle Scholar
  12. Bastian, T. S., Dulk, G. A., & Leblanc, Y. 1996, ApJ, 473, 539CrossRefADSGoogle Scholar
  13. Batchelor, D. A. 1994, Solar Phys, 155, 57CrossRefADSGoogle Scholar
  14. Belkora, L., Hurford, G. J., Gary, D. E. & Woody, D. P. 1992, ApJ, 400, 692CrossRefADSGoogle Scholar
  15. Berton. R. & Sakurai, T. 1985, Solar Phys, 96, 93CrossRefADSGoogle Scholar
  16. Bogod, V. M., & Grebinskij, A. S. 1997, Solar Phys, 176, 67CrossRefADSGoogle Scholar
  17. Brosius, J. W. 2004, (Chapter 13, this volume)Google Scholar
  18. Davila, J. M. 1994, ApJ, 423, 871CrossRefADSGoogle Scholar
  19. Daw, A., DeLuca, E. E., & Golub, L. 1995, ApJ, 453, 929CrossRefADSGoogle Scholar
  20. Ding, M. D. & Fang, C. 1989, A&A, 225, 204ADSGoogle Scholar
  21. Ewell, M. W. Jr., Zirin, H., Jensen, J. B., & Bastian, T. S. 1993, ApJ, 403, 426CrossRefADSGoogle Scholar
  22. Fontenla, J. M., Avrett, E. H., & Loeser, R. 1990, ApJ, 355, 700CrossRefADSGoogle Scholar
  23. Gabriel, A. H. 1976, Royal Society (London), Philosophical Transactions, Series A, 281, no. 1304, 339ADSCrossRefGoogle Scholar
  24. Gary, A., Davis, J. M., & Moore, R. 1998, Solar Phys, 183, 45CrossRefADSGoogle Scholar
  25. Gelfreikh, G. B. 2004, (Chapter 6, this volume)Google Scholar
  26. Grebinskij, A., Bogod, V., Gelfreikh, G., Urpo, S., Pohjolainen, S. & Shibasaki, K. 2000, A&AS, 144, 169ADSCrossRefGoogle Scholar
  27. Gu, Y., Jefferies, J. T., Lindsey, C. & Avrett, E. H. 1997, ApJ, 484, 960CrossRefADSGoogle Scholar
  28. Horne, K., Hurford, G. J., Zirin, H., & DeGraauw, Th. 1981, ApJ, 244, 340CrossRefADSGoogle Scholar
  29. Hurlburt, N. E., Martens, P, C. H., Slater, G. L., & Jaffey, S. M. 1994, in Solar Active Region Evolution: Comparing Models with Observations, ASP Conf. Ser., 68, 30Google Scholar
  30. Lang, K. R. 1980, Astrophysical Formulae. A Compendium for the Physicist and Astrophysicist, Berlin: SpringerGoogle Scholar
  31. Lee, J. W., McClymont, A. N., Mikic, Z., White, S. M., & Kundu, M. R. 1998, ApJ, 501, 853CrossRefADSGoogle Scholar
  32. Koutchmy, S., & Molodensky, M. M. 1992, Nature, 360, 717CrossRefADSGoogle Scholar
  33. Koutchmy, S., Merzlyakov, V. L., & Molodensky, M. M. 2001, Astronomy Reports, 45, 10, 834CrossRefGoogle Scholar
  34. Liewer, P. C., Hall, J. R., DeJong, M., Socker, D. G., Howard, R. A., Crane, P.C., Reiser, P., Rich, N., Vourlidas, A. 2001, JGR, 106/A8, 15903ADSCrossRefGoogle Scholar
  35. Maltby, P., Avrett, E. H., Carlsson, M., Kjeldseth-Moe, O., Kurucz, R. L., & Loeser, R. 1986, ApJ, 306, 284CrossRefADSGoogle Scholar
  36. Nitta, N., VanDriel-Gestelyi, L., & Harra-Murnion, L, K. 1999, Solar Phys, 189, 181CrossRefADSGoogle Scholar
  37. Obridko, V. N. & Staude, J. 1988, A&A, 189, 232ADSGoogle Scholar
  38. Roellig, T. L., Becklin, E. E., Jefferies, J. T., Kopp, G. A., Lindsey, C. A., Orral, F. Q., & Werner, M. W., 1991, ApJ, 381, 288CrossRefADSGoogle Scholar
  39. Ryabov, V. B. 2004, (Chapter 7, this volume)Google Scholar
  40. Vernazza, J. E., Avrett, E. H., & Loeser, R. 1981, ApJ Supp., 45, 635ADSCrossRefGoogle Scholar
  41. Vourlidas, A. 2004, (Chapter 11, this volume)Google Scholar
  42. Wannier, P. G., Hurford, G. J., & Seielstad, G. A. 1983, ApJ, 264, 660CrossRefADSGoogle Scholar
  43. White, S. M. 2004, (Chapter 5, this volume)Google Scholar
  44. Zidowitz, S. 1999, JGR, 104, 9727CrossRefADSGoogle Scholar
  45. Zirin, H., Baumert, B. M., & Hurford, G. J. 1991, ApJ, 370, 779CrossRefADSGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Markus J. Aschwanden
  • David Alexander
    • 1
  • Marc L. De Rosa
  1. 1.Rice UniversityUSA

Personalised recommendations