HDGM-RT is driven in part by the External Storm-time (Est) index forecasted using the Real-Time-Solar-Wind (RTSW) data provided by NOAA's Space Weather Prediction Center. The model uses the 81-day moving average of F10.7 cm solar flux data. Occasionally the real-time modeling can be adversely affected by broken upload links and corrupted data. If you notice anything unusual, please send us an email at geomag.models@noaa.gov.