Conferencia
Abstract:
Recognizing that loops are the main structures of the solar corona, we investigate how the magnetic field strength of coronal flux tubes depends on the end-to-end length of the tube for a sample of active regions. We use photospheric magnetograms from the Michelson Doppler Imager, aboard the Solar and Heliospheric Observatory, and compute potential and linear force-free extrapolation models. The free parameter of the models is adjusted so as to match the soft X-ray loops observed by the Solar X-ray Telescope that flew aboard Yohkoh. For each model, we determine the average coronal field strength, < B >, in approximately one thousand individual flux tubes with regularly spaced footpoints, and obtain scatter plots of < B > versus length, L. We determine the dependence of < B > with L for a wide range of flux-tube lengths and, then, we restrict to the range which is meaningful for the soft X-ray emission. For this range we find that < B >∼ L δ with δ = -1.3 ± 0.5. We compare our results with those of Mandrini et al. (2000), and find that both are fully consistent. Such studies have important implications for solar coronal heating models.
Registro:
| Documento: | Conferencia |
| Título: | On the scaling of magnetic field strength with loop length in solar active regions |
| Autor: | Mandrini, C.H.; Jain, R.; Innes D.E.; Lagg A.; Solanki S.K.; Danesy D. |
| Ciudad: | Katlenburg - Lindau |
| Filiación: | Instituto de Astronomía y Física del Espacio, IAFE, CONICET-UBA, CC. 67, Suc. 28, 1428, Buenos Aires, Argentina Department of Applied Mathematics, University of Sheffield, United Kingdom |
| Palabras clave: | Approximation theory; Extrapolation; Magnetometers; Telescopes; X rays; Coronal flux tubes; Michelson Doppler Imager; Soft X-ray loops; Solar active regions; Magnetic field effects |
| Año: | 2005 |
| Número: | 596 |
| Página de inicio: | 85 |
| Página de fin: | 90 |
| Título revista: | International Scientific Conference on Chromospheric and Coronal Magnetic Fields |
| Título revista abreviado: | Eur Space Agency Spec Publ ESA SP |
| ISSN: | 03796566 |
| CODEN: | ESPUD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n596_p85_Mandrini |
Referencias:
- Alissandrakis, C.E., (1981) A&A, 100, p. 197
- Aschwanden, M.J., (2000) ApJ, 531, p. 1129
- Aschwanden, M.J., Schrjver, C.J., Alexander, D., (2001) ApJ, 550, p. 1036
- Démoulin, P., Bagalá, L.G., Mandrini, C.H., Hénoux, J.C., Rovira, M.G., (1997) A&A, 325, p. 305
- Démoulin, P., Van Driel-Gesztelyi, L., Mandrini, C.H., Klimchuk, J.A., Harra, L., (2003) ApJ, 586, p. 592
- Fisher, G.H., Longcope, D.W., Metcalf, T.R., Pevtsov, A.A., (1998) ApJ, 508, p. 885
- Green, L.M., López Fuentes, M.C., Mandrini, C.H., Démoulin, P., Van Driel-Gesztelyi, L., Culhane, J.L., (2002) Solar Phys., 208, p. 43
- Jain, R., Yashiro, S., (2002) A&A, 394, p. 1111
- Mandrini, C.H., Démoulin, P., Klimchuk, J.A., (2000) ApJ, 530, p. 999
- Porter, L.J., Klimchuk, J.A., (1995) ApJ, 454, p. 499
- Sturrock, P.A., (1999) ApJ, 521, p. 451
- Van Driel-Gesztelyi, L., Démoulin, P., Mandrini, C.H., Harra, L., Klimchuk, J.A., (2003) ApJ, 586, p. 579
- Winebarger, A.R., Warren, H.P., Mariska, J.T., (2003) ApJ, 587, p. 439
- Yashiro, S., Shibata, K., (2001) A&A, 550, pp. L113-L116A4 - Max-Plank-Institut fuer Sonnensystemforschung; European Space Agency
Citas:
---------- APA ----------
Mandrini, C.H., Jain, R., Innes D.E., Lagg A., Solanki S.K. & Danesy D. (2005) . On the scaling of magnetic field strength with loop length in solar active regions. International Scientific Conference on Chromospheric and Coronal Magnetic Fields(596), 85-90.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n596_p85_Mandrini [ ]
---------- CHICAGO ----------
Mandrini, C.H., Jain, R., Innes D.E., Lagg A., Solanki S.K., Danesy D. "On the scaling of magnetic field strength with loop length in solar active regions" . International Scientific Conference on Chromospheric and Coronal Magnetic Fields, no. 596 (2005) : 85-90.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n596_p85_Mandrini [ ]
---------- MLA ----------
Mandrini, C.H., Jain, R., Innes D.E., Lagg A., Solanki S.K., Danesy D. "On the scaling of magnetic field strength with loop length in solar active regions" . International Scientific Conference on Chromospheric and Coronal Magnetic Fields, no. 596, 2005, pp. 85-90.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n596_p85_Mandrini [ ]
---------- VANCOUVER ----------
Mandrini, C.H., Jain, R., Innes D.E., Lagg A., Solanki S.K., Danesy D. On the scaling of magnetic field strength with loop length in solar active regions. Eur Space Agency Spec Publ ESA SP. 2005(596):85-90.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n596_p85_Mandrini [ ]
