Navegar

Colección

Datos Estadísticas

Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

We present a study of two regular sunspots that exhibit nearly uniform twist from the photosphere to the corona. We derive the twist parameter in the corona and in the chromosphere by minimizing the difference between the extrapolated linear force-free field model field lines and the observed intensity structures in the extreme-ultraviolet images of the Sun. The chromospheric structures appear more twisted than the coronal structures by a factor of two. Further, we derive the vertical component of electric current density, jz, using vector magnetograms from the Hinode Solar Optical Telescope (SOT). The spatial distribution of jzhas a zebra pattern of strong positive and negative values owing to the penumbral fibril structure resolved by Hinode/SOT. This zebra pattern is due to the derivative of the horizontal magnetic field across the thin fibrils; therefore, it is strong and masks weaker currents that might be present, for example, as a result of the twist of the sunspot. We decompose jzinto the contribution due to the derivatives along and across the direction of the horizontal field, which follows the fibril orientation closely. The map of the tangential component has more distributed currents that are coherent with the chromospheric and coronal twisted structures. Moreover, it allows us to map and identify the direct and return currents in the sunspots. Finally, this decomposition of jzis general and can be applied to any vector magnetogram in order to better identify the weaker large-scale currents that are associated with coronal twisted/sheared structures. © 2014. The American Astronomical Society. All rights reserved..

Registro:

Documento: Artículo
Título:Distribution of electric currents in sunspots from photosphere to corona
Autor:Gosain, S.; Démoulin, P.; López Fuentes, M.
Filiación:National Solar Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, United States
Observatoire de Paris, LESIA, UMR 8109 (CNRS), Meudon Principal cedex, F-92195, France
Instituto de Astronomía y Física Del Espacio (IAFE), UBA-CONICET, CC. 67, Suc, 28 Buenos Aires, 1428, Argentina
Palabras clave:magnetic fields; Sun: chromosphere; Sun: corona; Sun: photosphere; sunspots
Año:2014
Volumen:793
Número:1
DOI: http://dx.doi.org/10.1088/0004-637X/793/1/15
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v793_n1_p_Gosain

Referencias:

  • Abramenko, V.I., Wang, T., Yurchishin, V.B., (1996) SoPh, 168, p. 75
  • Alissandrakis, C.E., (1981) A&A, 100, p. 197
  • Aulanier, G., Démoulin, P., Grappin, R., (2005) A&A, 430, p. 1067
  • Balasubramaniam, K.S., Pevtsov, A., Rogers, J., (2004) ApJ, 608 (2), p. 1148
  • Bao, S., Zhang, H., (1998) ApJL, 496, p. 43
  • Burnette, A.B., Canfield, R.C., Pevtsov, A.A., (2004) ApJ, 606 (1), p. 565
  • Chae, J., Moon, Y.-J., Rust, D.M., Wang, H., Goode, P.R., (2003) JKAS, 36 (1), p. 33
  • Démoulin, P., Hénoux, J.C., Mandrini, C.H., Priest, E.R., (1997) SoPh, 174, p. 73
  • Gary, G.A., (2001) SoPh, 203, p. 71
  • Gosain, S., Pevtsov, A.A., Rudenko, G.V., Anfinogentov, S.A., (2013) ApJ, 772 (1), p. 52
  • Green, L.M., López Fuentes, M., Mandrini, C., (2002) SoPh, 208, p. 43
  • Green, L.M., Kliem, B., Wallace, A.J., (2011) A&A, 526, p. 2
  • Hale, G.E., (1927) Natur, 119, p. 708
  • Harvey, J.W., (2012) SoPh, 280, p. 69
  • Ichimoto, K., Lites, B., Elmore, D., (2008) SoPh, 249, p. 233
  • Kosugi, T., Matsuzaki, K., Sakao, T., (2007) SoPh, 243, p. 3
  • Lemen, J.R., Title, A.M., Akin, D.J., (2012) SoPh, 275, p. 17
  • Lin, H., Penn, M.J., Tomczyk, S., (2000) ApJL, 541, p. 83
  • Lites, B.W., Ichimoto, K., (2013) SoPh, 283, p. 601
  • Longcope, D.W., Welsch, B.T., (2000) ApJ, 545 (2), p. 1089
  • López Fuentes, M.C., Klimchuk, J.A., Démoulin, P., (2006) ApJ, 639 (1), p. 459
  • Mandrini, C.H., Démoulin, P., Van Driel-Gesztelyi, L., (2004) Ap&SS, 290, p. 319
  • Mandrini, C.H., Pohjolainen, S., Dasso, S., (2005) A&A, 434, p. 725
  • Martínez Pillet, V., (2000) A&A, 361, p. 734
  • Metcalf, T.R., Leka, K.D., Barnes, G., (2006) SoPh, 237, p. 267
  • Nakagawa, Y., Raadu, M.A., Billings, D.E., McNamara, D., (1971) SoPh, 19, p. 72
  • Nakwacki, M., Dasso, S., Démoulin, P., Mandrini, C.H., Gulisano, A.M., (2011) A&A, 535, p. 52
  • Parker, E.N., (1984) ApJ, 283, p. 343
  • Parker, E.N., (1996) ApJ, 471 (1), p. 485
  • Pesnell, W.D., Thompson, B.J., Chamberlin, P.C., (2012) SoPh, 275, p. 3
  • Pevtsov, A.A., Canfield, R.C., McClymont, A.N., (1997) ApJ, 481 (2), p. 973
  • Pevtsov, A.A., Canfield, R.C., Metcalf, T.R., (1994) ApJL, 425, p. 117
  • Pevtsov, A.A., Canfield, R.C., Metcalf, T.R., (1995) ApJL, 440, p. 109
  • Puschmann, K.G., Ruiz Cobo, B., Martínez Pillet, V., (2010) ApJ, 720 (2), p. 1417
  • Ravindra, B., Venkatakrishnan, P., Tiwari, S.K., Bhattacharyya, R., (2011) ApJ, 740 (1), p. 19
  • Rust, D.M., Kumar, A., (1996) ApJL, 464, p. 199
  • Scherrer, P.H., Schou, J., Bush, R.I., (2012) SoPh, 275, p. 207
  • Schmidt, H.U., (1964) NASSP, 50, p. 107
  • Seehafer, N., (1990) SoPh, 125, p. 219
  • Semel, M., (1967) AnAp, 30, p. 513
  • Solanki, S.K., Montavon, C.A.P., (1993) A&A, 275, p. 283
  • Spruit, H.C., (1979) SoPh, 61, p. 363
  • Su, J.T., Sakurai, T., Suematsu, Y., Hagino, M., Liu, Y., (2009) ApJL, 697, p. 103
  • Title, A.M., Frank, Z.A., Shine, R.A., (1993) ApJ, 403, p. 780
  • Török, T., Leake, J.E., Titov, V.S., (2014) ApJL, 782, p. 10
  • Tsuneta, S., Ichimoto, K., Katsukawa, Y., (2008) SoPh, 249, p. 167
  • Venkatakrishnan, P., Hagyard, M.J., Hathaway, D.H., (1988) SoPh, 115, p. 125
  • Venkatakrishnan, P., Tiwari, S.K., (2009) ApJL, 706, p. 114
  • Wheatland, M.S., (2000) ApJ, 532 (1), p. 616

Citas:

---------- APA ----------
Gosain, S., Démoulin, P. & López Fuentes, M. (2014) . Distribution of electric currents in sunspots from photosphere to corona. Astrophysical Journal, 793(1).
http://dx.doi.org/10.1088/0004-637X/793/1/15
---------- CHICAGO ----------
Gosain, S., Démoulin, P., López Fuentes, M. "Distribution of electric currents in sunspots from photosphere to corona" . Astrophysical Journal 793, no. 1 (2014).
http://dx.doi.org/10.1088/0004-637X/793/1/15
---------- MLA ----------
Gosain, S., Démoulin, P., López Fuentes, M. "Distribution of electric currents in sunspots from photosphere to corona" . Astrophysical Journal, vol. 793, no. 1, 2014.
http://dx.doi.org/10.1088/0004-637X/793/1/15
---------- VANCOUVER ----------
Gosain, S., Démoulin, P., López Fuentes, M. Distribution of electric currents in sunspots from photosphere to corona. Astrophys. J. 2014;793(1).
http://dx.doi.org/10.1088/0004-637X/793/1/15