Abstract
Data concerning solar energetic events, published in 1996–2004 by the USAF/NOAA in the form of daily reports, have been collected. The analysis of the particular event types indicates that the degree of their geoeffectiveness depends on their size and on their solar disc location. The mere information that a solar X-flare (XRA) event or a Long Duration XRA Event (LDE) has occurred on the solar disc is insufficient to produce a relevant forecast of geomagnetic disturbances. The probability increases if the XRA is of class X which has occurred on the solar disk in central region (30 °E, 30 °W; 30 °S, 30 °N). XRAs associated with metric type II and IV radio bursts (RSP II and RSP IV), which occurred on the solar disc in this region will very probably cause a geomagnetic disturbance not only if X class are involved, but also M class and B–C class. The Disappearance of Solar Filament (DSF) data cannot be used in forecasting geomagnetic disturbances. The geoeffective and nongeoeffective DSFs are too disproportional.
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