Space weather conditions in European area during October 2003 increase of solar activity

Rapid increase of solar activity during October-November 2003 period causes series of unexpected phenomena in radio-propagation conditions. It indicates also deficiencies of actually exploited electron concentration models and systems for the radio-conditions prediction and forecast. Paper presents post-factum analysis of the conditions during this increase of space weather activity. Their modeling by means of IRI as well as other models is discussed. Desired approach for future applications in radio conditions modeling for systems is specified.