Abstract
We performed for the first time stereoscopic triangulation of coronal loops in active regions over the entire range of spacecraft separation angles (α sep≈6∘,43∘,89∘,127∘,and 170∘). The accuracy of stereoscopic correlation depends mostly on the viewing angle with respect to the solar surface for each spacecraft, which affects the stereoscopic correspondence identification of loops in image pairs. From a simple theoretical model we predict an optimum range of α sep≈22∘ – 125∘, which is also experimentally confirmed. The best accuracy is generally obtained when an active region passes the central meridian (viewed from Earth), which yields a symmetric view for both STEREO spacecraft and causes minimum horizontal foreshortening. For the extended angular range of α sep≈6∘ – 127∘ we find a mean 3D misalignment angle of μ PF≈21∘ – 39∘ of stereoscopically triangulated loops with magnetic potential-field models, and μ FFF≈15∘ – 21∘ for a force-free field model, which is partly caused by stereoscopic uncertainties μ SE≈9∘. We predict optimum conditions for solar stereoscopy during the time intervals of 2012 – 2014, 2016 – 2017, and 2021 – 2023.
Similar content being viewed by others
References
Aschwanden, M.J.: 2009, Space Sci. Rev. 149, 31.
Aschwanden, M.J.: 2012, Solar Phys. doi: 10.1007/s11207-012-0069-7 .
Aschwanden, M.J., Malanushenko, A.: 2012, Solar Phys. doi: 10.1007/s11207-012-0070-1 .
Aschwanden, M.J., Sandman, A.W.: 2010, Astron. J. 140, 723.
Aschwanden, M.J., Wülser, J.P., Nitta, N., Lemen, J.: 2008, Astrophys. J. 679, 827.
Aschwanden, M.J., Wuelser, J.-P., Nitta, N.V., Lemen, J.R., Schrijver, C.J., DeRosa, M., Malanushenko, A.: 2012. Astrophys. J. doi: 10.1088/0004-637X/755/1/1 .
Bemporad, A.: 2009, Astrophys. J. 701, 298.
Berger, T.E., DePontieu, B., Fletcher, L., Schrijver, C.J., Tarbell, T.D., Title, A.M.: 1999, Solar Phys. 190, 409.
DeRosa, M.L., Schrijver, C.J., Barnes, G., Leka, K.D., Lites, B.W., Aschwanden, M.J., Amari, T., Canou, A., McTiernan, J.M., Regnier, S., Thalmann, J., Valori, G., Wheatland, M.S., Wiegelmann, T., Cheung, M.C.M., Conlon, P.A., Fuhrmann, M., Inhester, B., Tadesse, T.: 2009, Astrophys. J. 696, 1780.
Feng, L., Inhester, B., Solanki, S., Wiegelmann, T., Podlipnik, B., Howard, R.A., Wülser, J.P.: 2007, Astrophys. J. Lett. 671, L205.
Feng, L., Inhester, B., Solanki, S.K., Wilhelm, K., Wiegelmann, T., Podlipnik, B., Howard, R.A., Plunkett, S.P., Wülser, J.P., Gan, W.Q.: 2009, Astrophys. J. 700, 292.
Howard, R.A., Howard, R.A., Moses, J.D., Vourlidas, A., Newmark, J.S., Socker, D.G., Plunkett, S.P., Korendyke, C.M., Cook, J.W., Hurley, A., Davila, J.M., et al.: 2008, Space Sci. Rev. 136, 67.
Inhester, B.: 2006, arXiv:astro-ph/0612649 .
Kaiser, M.L., Kucera, T.A., Davila, J.M., St. Cyr, O.C., Guhathakurta, M., Christian, E.: 2008, Space Sci. Rev. 136, 5.
Liewer, P.C., DeJong, E.M., Hall, J.R., Howard, R.A., Thompson, W.T., Culhane, J.L., Bone, L., van Driel-Gesztelyi, L.: 2009, Solar Phys. 256, 57.
Sandman, A.W., Aschwanden, M.J.: 2011, Solar Phys. 270, 503.
Sandman, A., Aschwanden, M.J., DeRosa, M., Wülser, J.P., Alexander, D.: 2009, Solar Phys. 259, 1.
Thompson, W.T.: 2006, Astron. Astrophys. 449, 791.
Thompson, W.T.: 2011, J. Atmos. Solar-Terr. Phys. 73, 1138.
Thompson, W.T., Davila, J.M., St. Cyr, O.C., Reginald, N.L.: 2011, Solar Phys. 272, 215.
Wülser, J.P., Lemen, J.R., Tarbell, T.D., Wolfson, C.J., Cannon, J.C., Carpenter, B.A., Duncan, D.W., Gradwohl, G.S., Meyer, S.B., Moore, A.S., et al.: 2004, Proc. SPIE 5171, 111.
Acknowledgements
This work is supported by the NASA STEREO mission under NRL contract N00173-02-C-2035. The STEREO/SECCHI data used here are produced by an international consortium of the Naval Research Laboratory (USA), Lockheed Martin Solar and Astrophysics Lab. (USA), NASA Goddard Space Flight Center (USA), Rutherford Appleton Laboratory (UK), University of Birmingham (UK), Max-Planck-Institut für Sonnensystemforschung (Germany), Centre Spatiale de Liège (Belgium), Institut d’Optique Théorique et Applique (France), Institute d’Astrophysique Spatiale (France). The USA institutions were funded by NASA; the UK institutions by the Science & Technology Facility Council (which used to be the Particle Physics and Astronomy Research Council, PPARC); the German institutions by Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR); the Belgian institutions by Belgian Science Policy Office; the French institutions by Centre National d’Etudes Spatiales (CNES), and the Centre National de la Recherche Scientifique (CNRS). The NRL effort was also supported by the USAF Space Test Program and the Office of Naval Research.
Author information
Authors and Affiliations
Corresponding author
Additional information
The Sun 360
Guest Editors: Bernhard Fleck, Bernd Heber, and Angelos Vourlidas
Rights and permissions
About this article
Cite this article
Aschwanden, M.J., Wülser, JP., Nitta, N. et al. Solar Stereoscopy with STEREO/EUVI A and B Spacecraft from Small (6∘) to Large (170∘) Spacecraft Separation Angles. Sol Phys 281, 101–119 (2012). https://doi.org/10.1007/s11207-012-0092-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11207-012-0092-8