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Coronal Temperature Maps from Solar EUV Images: A Blind Source Separation Approach
- Source :
- Solar Physics, Solar Physics, Springer Verlag, 2013, 283 (1), pp.31-47. ⟨10.1007/s11207-012-0142-2⟩, Solar Physics, 2013, 283 (1), pp.31-47. ⟨10.1007/s11207-012-0142-2⟩
- Publication Year :
- 2013
- Publisher :
- HAL CCSD, 2013.
-
Abstract
- Multi-wavelength solar images in the EUV are routinely used for analysing solar features such as coronal holes, filaments, and flares. However, images taken in different bands often look remarkably similar as each band receives contributions coming from regions with a range of different temperatures. This has motivated the search for empirical techniques that may unmix these contributions and concentrate salient morphological features of the corona in a smaller set of less redundant source images. Blind Source Separation (BSS) precisely does this. Here we show how this novel concept also provides new insight into the physics of the solar corona, using observations made by SDO/AIA. The source images are extracted using a Bayesian positive source separation technique. We show how observations made in six spectral bands, corresponding to optically thin emissions, can be reconstructed by linear combination of three sources. These sources have a narrower temperature response and allow for considerable data reduction since the pertinent information from all six bands can be condensed in only one single composite picture. In addition, they give access to empirical temperature maps of the corona. The limitations of the BSS technique and some applications are briefly discussed.<br />to appear in Solar Physics (2012)
- Subjects :
- Ultraviolet spectrum
010504 meteorology & atmospheric sciences
Solar image processing
Extreme ultraviolet lithography
Bayesian inference
FOS: Physical sciences
Coronal hole
Solar corona
01 natural sciences
7. Clean energy
Blind signal separation
0103 physical sciences
Range (statistics)
Linear combination
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Physics
Astronomy and Astrophysics
Spectral bands
Computational physics
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
[SDU]Sciences of the Universe [physics]
Extreme ultraviolet
Physics - Data Analysis, Statistics and Probability
Blind source separation
Data Analysis, Statistics and Probability (physics.data-an)
Data reduction
Subjects
Details
- Language :
- English
- ISSN :
- 00380938 and 1573093X
- Database :
- OpenAIRE
- Journal :
- Solar Physics, Solar Physics, Springer Verlag, 2013, 283 (1), pp.31-47. ⟨10.1007/s11207-012-0142-2⟩, Solar Physics, 2013, 283 (1), pp.31-47. ⟨10.1007/s11207-012-0142-2⟩
- Accession number :
- edsair.doi.dedup.....bfe3d5cef61b7adf947e15c4f0d93ae6