Tag: Correlation

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May 18, 2011

AAVSO Alert Notice 440: PEP Observing Campaign on P Cygni

AAVSO Alert Notice 440 PEP Observing Campaign on P Cygni May 17, 2011 Ernst Pollmann, Chairman of the VdS-Spectroscopy-Group in Germany and an ative spectroscopist, has…

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The Sun Now (Visible light)		The Sun Now (H-Alpha light)

Aurora Oval (Northern Hemisphere)		Aurora Oval (Southern Hemisphere)