A solar cycle 25 prediction based on 4D-var data assimilation approach

AS Brun, CP Hung, A Fournier, L Jouve… - Proceedings of the …, 2019 - cambridge.org
AS Brun, CP Hung, A Fournier, L Jouve, O Talagrand, A Strugarek, S Hazra
Proceedings of the International Astronomical Union, 2019cambridge.org
Based on our modern 4D-var data assimilation pipeline Solar Predict we present in this
short proceeding paper our prediction for the next solar cycle 25. As requested by the Solar
Cycle 25 panel call issued on January 2019 by NOAA/SWPC and NASA, we predict the
timing of next minimum and maximum as well as their amplitude. Our results are the
following: the minimum should have occured within the first semester of year 2019. The
maximum should occur in year 2024.4±6 months, with a value of the sunspot number equal …
Based on our modern 4D-var data assimilation pipeline Solar Predict we present in this short proceeding paper our prediction for the next solar cycle 25. As requested by the Solar Cycle 25 panel call issued on January 2019 by NOAA/SWPC and NASA, we predict the timing of next minimum and maximum as well as their amplitude. Our results are the following: the minimum should have occured within the first semester of year 2019. The maximum should occur in year 2024.4 ± 6 months, with a value of the sunspot number equal to 92±10. This is in agreement with the NOAA/NASA consensus published in April 2019. Note that our prediction errors are based on 1-σ measure and do not consider all the systematics, so they are likely underestimated. We will update our prediction and error analysis regularly as more data becomes available and we improve our prediction pipeline.
Cambridge University Press
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