Sunspot and Geomagnetic-storm Data
Sunspot Cycle and Ionospheric Storms
Dichotomy in Geomagnetic Disturbance and Its Solar Origin
The sun has a dominant influence on the terrestrial environment, an environment which affects many phases of direct military interests such as the upper atmosphere, communications, satellite operations, weather, etc. The results obtained add to the interpretation of the solar terrestrial relationships that may add to their predictability. Superposed epoch studies of the daily sunspot numbers (Rz) show a different behavior when selected for daily sums of geomagnetic activity (SKp) of 45 up to 56 than for higher or lower values of SKp. (Author Modified Abstract).
Solar-terrestrial Physics Services and Publications
Conditional Probabilities of the Geomagnetic Index Ap
Data of the geomagnetic index A sub p from 1932 to 1973 were used to determine the conditional probabilities for the occurrence of certain values of that index. The range of values was divided into three categories that approximately correspond to quiet, moderate, and disturbed levels of geomagnetic activity. Conditions applied were the category level of activity on the initial and subsequent day and the portion of the solar sunspot cycle. Conditional probabilities were determined for 100 successive days after the initial day, both for the quiet and active portions of the sunspot cycle. (Author).
