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Abstract:

Using differential emission measure tomography (DEMT) based on time series of EUV images, we carry out a quantitative comparative analysis of the three-dimensional (3D) structure of the electron density and temperature of the inner corona (r<1.25R⊙) between two specific rotations selected from the last two solar minima, namely Carrington Rotations (CR)1915 and CR-2081. The analysis places error bars on the results because of the systematic uncertainty of the sources. While the results for CR-2081 are characterized by a remarkable north–south symmetry, the southern hemisphere for CR-1915 exhibits higher densities and temperatures than the northern hemisphere. The core region of the streamer belt in both rotations is found to be populated by structures whose temperature decreases with height (called “down loops” in our previous articles). They are characterized by plasma β≳ 1 , and may be the result of the efficient dissipation of Alfvén waves at low coronal heights. The comparative analysis reveals that the low latitudes of the equatorial streamer belt of CR-1915 exhibit higher densities than for CR-2081. This cannot be explained by the systematic uncertainties. In addition, the southern hemisphere of the streamer belt of CR-1915 is characterized by higher temperatures and density scale heights than for CR-2081. On the other hand, the coronal hole region of CR-1915 shows lower temperatures than for CR-2081. The reported differences are in the range ≈10–25%, depending on the specific physical quantity and region that is compared, as fully detailed in the analysis. For other regions and/or physical quantities, the uncertainties do not allow assessing the thermodynamical differences between the two rotations. Future investigation will involve a DEMT analysis of other Carrington rotations selected from both epochs, and also a comparison of their tomographic reconstructions with magnetohydrodynamical simulations of the inner corona. © 2017, Springer Science+Business Media B.V.

Registro:

Documento: Artículo
Título:Comparative Study of the Three-Dimensional Thermodynamical Structure of the Inner Corona of Solar Minimum Carrington Rotations 1915 and 2081
Autor:Lloveras, D.G.; Vásquez, A.M.; Nuevo, F.A.; Frazin, R.A.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE), CONICET-UBA, CC 67 - Suc 28, Ciudad Autónoma de Buenos Aires, C1428ZAA, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales (FCEN), Universidad de Buenos Aires (UBA), Pabellón I, Ciudad Universitaria, Ciudad Autónoma de Buenos Aires, C1428ZAA, Argentina
Departamento de Ciencia y Tecnología, Universidad Nacional de Tres de Febrero (UNTREF), Valentín Gómez 4752, Caseros, Provincia de Buenos Aires B1678ABH, Argentina
Department of Climate and Space Sciences and Engineering (CLaSP), University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109-2143, United States
Palabras clave:Corona, E; Corona, Structures; Solar Cycle, Observations
Año:2017
Volumen:292
Número:10
DOI: http://dx.doi.org/10.1007/s11207-017-1179-z
Título revista:Solar Physics
Título revista abreviado:Sol. Phys.
ISSN:00380938
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00380938_v292_n10_p_Lloveras

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Citas:

---------- APA ----------
Lloveras, D.G., Vásquez, A.M., Nuevo, F.A. & Frazin, R.A. (2017) . Comparative Study of the Three-Dimensional Thermodynamical Structure of the Inner Corona of Solar Minimum Carrington Rotations 1915 and 2081. Solar Physics, 292(10).
http://dx.doi.org/10.1007/s11207-017-1179-z
---------- CHICAGO ----------
Lloveras, D.G., Vásquez, A.M., Nuevo, F.A., Frazin, R.A. "Comparative Study of the Three-Dimensional Thermodynamical Structure of the Inner Corona of Solar Minimum Carrington Rotations 1915 and 2081" . Solar Physics 292, no. 10 (2017).
http://dx.doi.org/10.1007/s11207-017-1179-z
---------- MLA ----------
Lloveras, D.G., Vásquez, A.M., Nuevo, F.A., Frazin, R.A. "Comparative Study of the Three-Dimensional Thermodynamical Structure of the Inner Corona of Solar Minimum Carrington Rotations 1915 and 2081" . Solar Physics, vol. 292, no. 10, 2017.
http://dx.doi.org/10.1007/s11207-017-1179-z
---------- VANCOUVER ----------
Lloveras, D.G., Vásquez, A.M., Nuevo, F.A., Frazin, R.A. Comparative Study of the Three-Dimensional Thermodynamical Structure of the Inner Corona of Solar Minimum Carrington Rotations 1915 and 2081. Sol. Phys. 2017;292(10).
http://dx.doi.org/10.1007/s11207-017-1179-z