Forbush Decrease Prediction Based on Remote Solar Observations
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We employ remote observations of coronal mass ejections (CMEs) and the associated solar flares to forecast the CME-related Forbush decreases, i.e. short-term depressions in the galactic cosmic-ray flux. The relation between the Forbush effect at Earth and remote observations of CMEs and associated solar flares is studied via a statistical analysis. Relations between Forbush decrease magnitude and several CME/flare parameters were found: the initial CME speed, apparent width, source position, associated solar-flare class, and the effect of successive-CME occurrence. Based on the statistical analysis, remote solar observations are employed to forecast a Forbush-decrease. For this purpose, an empirical probabilistic model is constructed that uses selected remote solar observations of the CME and associated solar flare as input and gives the expected Forbush-decrease magnitude range as output. The forecast method is evaluated using several verification measures, indicating that as the forecast tends to be more specific, it is less reliable, which is its main drawback. However, the advantages of the method are that it provides an early prediction and that the input does not necessarily depend on using a spacecraft.
KeywordsCoronal mass ejections: low coronal signatures Cosmic rays: galactic
This work has been supported in part by the Croatian Science Foundation under the project 6212 “Solar and Stellar Variability”. M. Dumbović and J. Čalogović acknowledge the support by the ESF project PoKRet.
Disclosure of Potential Conflicts of Interest
The authors declare that they have no conflicts of interest.
- Chertok, I.M., Grechnev, V.V., Belov, A.V., Abunin, A.A.: 2013, Magnetic flux of EUV arcade and dimming regions as a relevant parameter for early diagnostics of solar eruptions – sources of non-recurrent geomagnetic storms and Forbush decreases. Solar Phys. 282, 175. DOI. ADS. ADSCrossRefGoogle Scholar
- Sudar, D., Vršnak, B., Dumbović, M.: 2015, Predicting coronal mass ejection transit time to Earth with neural network. Mon. Not. Roy. Astron. Soc., accepted. Google Scholar
- Wibberenz, G., Cane, H.V., Richardson, I.G.: 1997, Two-step Forbush decreases in the inner solar system and their relevance for models of transient disturbances. In: Potgieter, M.S., Raubenheimer, C., van der Walt, D.J. (eds.) Proceedings of the 25th Int. Cosmic Ray Conf., Durban, 1, 397. ADS. Google Scholar