Improved 12-month forecasts of the monthly sunspot number (Standard curves method): ----------------------------------------------------------------------------------- Time range: from -5 months before last elapsed month (provisional values) to +12 months after. Data description: Improved 12-month ahead predictions obtained by applying an adaptative Kalman filter to the primary Standard Curve (SC) prodictions from WDC-SILSO. This technique improves the approximation of the smoothed monthly sunspot number over the last 6 months, i.e. the interval between the last available smoothed value of the sunspot number and the current month of the prediction. (Ref.: T. Podladchikova, R. Van der Linden, 2012: "A Kalman Filter Technique for Improving Medium-Term Predictions of the Sunspot Number". Solar Physics. DOI: 10.1007/s11207-011-9899-y https://link.springer.com/article/10.1007/s11207-011-9899-y For any scientific use please refer to this paper) ------------------------------------------------------------------------------- TXT ------------------------------------------------------------------------------- Filename: KFprediSC.dat Format: plain ASCII text Columns: Column 1: Year Column 2: Month Column 3: Date in fraction of year (mid-month, ~ day 15) Column 4: Forecasted monthly mean value Column 5: Uncertainty on the forcasted monthly value (+/-). (NB: The first 3 values are null, as they simply replicate those from the original predictions.) Line format [character position]: - [1-4] Year - [6-7] Month - [10-17] Decimal date - [22-26] Forecasted monthly value - [28-32] Uncertainty (+/-)