Artículo

Selhorst, C.L.; Simoes, P.J.A.; Brajša, R.; Valio, A.; De Castro, C.G.G.; Costa, J.E.R.; Menezes, F.; Rozelot, J.P.; Hales, A.S.; Iwai, K.; White, S. "Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA" (2019) Astrophysical Journal. 871(1)
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Abstract:

Polar brightening of the Sun at radio frequencies has been studied for almost 50 years and yet a disagreement persists between solar atmospheric models and observations. Some observations reported brightening values much smaller than the expected values obtained from the models, with discrepancies being particularly large at millimeter wavelengths. New clues to calibrate the atmospheric models can be obtained with the advent of the Atacama Large Millimeter/submillimeter Array (ALMA) radio interferometer. In this work, we analyzed the lower limit of the polar brightening observed at 100 and 230 GHz by ALMA, during its Science Verification period, 2015 December 16-20. We find that the average polar intensity is higher than the disk intensity at 100 and 230 GHz, with larger brightness intensities at the south pole in eight of the nine maps analyzed. The observational results were compared with calculations of the millimetric limb brightening emission for two semi-empirical atmospheric models, FAL-C and SSC. Both models presented larger limb intensities than the average observed values. The intensities obtained with the SSC model were closer to the observations, with polar brightenings of 10.5% and 17.8% at 100 and 230 GHz, respectively. This discrepancy may be due to the presence of chromospheric features (like spicules) at regions close to the limb. © 2019. The American Astronomical Society. All rights reserved..

Registro:

Documento: Artículo
Título:Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA
Autor:Selhorst, C.L.; Simoes, P.J.A.; Brajša, R.; Valio, A.; De Castro, C.G.G.; Costa, J.E.R.; Menezes, F.; Rozelot, J.P.; Hales, A.S.; Iwai, K.; White, S.
Filiación:NAT - Nucleo de Astrofisica Teórica, Universidade Cruzeiro Do sul, Sao Paulo, SP, Brazil
SUPA School of Physics and Astronomy, University of GlasgowG12 8QQ, United Kingdom
CRAAM, Universidade Presbiteriana Mackenzie, Sao Paulo, SP, 01302-907, Brazil
Hvar Observatory, Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
IAFE, Universidad de Buenos Aires, CONICET, Buenos Aires, Argentina
CEA, Instituto Nacional de Pesquisas Espaciais, Sao José dos Campos, SP, Brazil
Université Côte d'Azur, 77 Chemin des Basses Moulieres, Grasse, F-06130, France
Joint ALMA Observatory, Avenida Alonso de Córdova 3107, Vitacura, Santiago, 7630355, Chile
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, United States
Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan
Space Vehicles Division, Air Force Research Laboratory, Albuquerque, NM, United States
Palabras clave:Sun: chromosphere; Sun: general; Sun: photosphere; Sun: radio radiation
Año:2019
Volumen:871
Número:1
DOI: http://dx.doi.org/10.3847/1538-4357/aaf4f2
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:http://digital.bl.fcen.uba.ar/collection/paper/document/paper_0004637X_v871_n1_p_Selhorst

Referencias:

  • Alissandrakis, C.E., Patsourakos, S., Nindos, A., Bastian, T.S., (2017) A&A, 605, p. A78
  • Bastian, T.S., Dulk, G.A., Leblanc, Y., (1996) ApJ, 473 (1), p. 539
  • Brajša, R., Benz, A.O., Temmer, M., (2007) SoPh, 245, p. 167
  • Brajša, R., Sudar, D., Benz, A.O., (2018) A&A, 613, p. A17
  • Costa, J.E.R., Silva, A.V.R., Makhmutov, V.S., (1999) ApJL, 520, p. L63
  • Efanov, V.A., Moissev, I.G., Nesterov, N.S., Stewart, R.T., (1980) IAU Symp., 86, Radio Physics of the Sun, p. 141. , ed M. R. Kundu and T. E. Gergely (Dordrecht: Reidel)
  • Fontenla, J.M., Avrett, E.H., Loeser, R., (1993) ApJ, 406, p. 319
  • Gelfreikh, G.B., Makarov, V.I., Tlatov, A.G., Riehokainen, A., Shibasaki, K., (2002) A&A, 389, p. 618
  • Gopalswamy, N., Shibasaki, K., Thompson, B.J., Gurman, J., Deforest, C., (1999) JGR, 104, p. 9767
  • Horne, K., Hurford, G.J., Zirin, H., De Graauw, T., (1981) ApJ, 244, p. 340
  • Iwai, K., Shimojo, M., (2015) ApJ, 804 (1), p. 48
  • Iwai, K., Shimojo, M., Asayama, S., (2017) SoPh, 292, p. 22
  • Kosugi, T., Ishiguro, M., Shibasaki, K., (1986) PASJ, 38, p. 1
  • Kurucz, R.L., (1970) SAOSR, 309, p. 1
  • Menezes, F., Valio, A., (2017) SoPh, 292, p. 195
  • Nakajima, H., Nishio, M., Enome, S., (1994) IEEEP, 82, p. 705
  • Oliveira E Silva, A.J., Selhorst, C.L., Simões, P.J.A., Giménez De Castro, C.G., (2016) A&A, 592, p. A91
  • Pohjolainen, S., Portier-Fozzani, F., Ragaigne, D., (2000) A&AS, 143, p. 227
  • Rozelot, J.P., Kosovichev, A., Kilcik, A., (2015) ApJ, 812 (2), p. 91
  • Selhorst, C.L., Giménez De Castro, C.G., Válio, A., Costa, J.E.R., Shibasaki, K., (2011) ApJ, 734 (1), p. 64
  • Selhorst, C.L., Giménez De Castro, C.G., Varela Saraiva, A.C., Costa, J.E.R., (2010) A&A, 509, p. A51
  • Selhorst, C.L., Silva, A.V.R., Costa, J.E.R., (2005) A&A, 433, p. 365
  • Selhorst, C.L., Silva, A.V.R., Costa, J.E.R., (2005) A&A, 440, p. 367
  • Selhorst, C.L., Silva, A.V.R., Costa, J.E.R., Shibasaki, K., (2003) A&A, 401, p. 1143
  • Selhorst, C.L., Simões, P.J.A., Oliveira E Silva, A.J., (2017) ApJ, 851 (2), p. 146
  • Shibasaki, K., (1998) ASP Conf. Ser. 140, Synoptic Solar Physics, p. 373. , ed K. S. Balasubramaniam, J. Harvey and D. Rabin (San Francisco, CA: ASP)
  • Shibasaki, K., (2013) PASJ, 65, p. S17
  • Simões, P.J.A., Kerr, G.S., Fletcher, L., (2017) A&A, 605, p. A125
  • Van Hoof, P.A.M., Williams, R.J.R., Volk, K., (2014) MNRAS, 444, p. 420
  • Vernazza, J.E., Avrett, E.H., Loeser, R., (1981) ApJS, 45, p. 635
  • Wedemeyer, S., Bastian, T., Brajša, R., (2016) SSRv, 200, p. 1
  • White, S.M., Iwai, K., Phillips, N.M., (2017) SoPh, 292, p. 88
  • Zirin, H., Baumert, B.M., Hurford, G.J., (1991) ApJ, 370, p. 779

Citas:

---------- APA ----------
Selhorst, C.L., Simoes, P.J.A., Brajša, R., Valio, A., De Castro, C.G.G., Costa, J.E.R., Menezes, F.,..., White, S. (2019) . Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA. Astrophysical Journal, 871(1).
http://dx.doi.org/10.3847/1538-4357/aaf4f2
---------- CHICAGO ----------
Selhorst, C.L., Simoes, P.J.A., Brajša, R., Valio, A., De Castro, C.G.G., Costa, J.E.R., et al. "Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA" . Astrophysical Journal 871, no. 1 (2019).
http://dx.doi.org/10.3847/1538-4357/aaf4f2
---------- MLA ----------
Selhorst, C.L., Simoes, P.J.A., Brajša, R., Valio, A., De Castro, C.G.G., Costa, J.E.R., et al. "Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA" . Astrophysical Journal, vol. 871, no. 1, 2019.
http://dx.doi.org/10.3847/1538-4357/aaf4f2
---------- VANCOUVER ----------
Selhorst, C.L., Simoes, P.J.A., Brajša, R., Valio, A., De Castro, C.G.G., Costa, J.E.R., et al. Solar Polar Brightening and Radius at 100 and 230 GHz Observed by ALMA. Astrophys. J. 2019;871(1).
http://dx.doi.org/10.3847/1538-4357/aaf4f2