Determination of the Auroral Oval Q Index from the Air Weather Service K Index
Scientific interim rept.
PHILLIPS LAB HANSCOM AFB MA
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The AWS determines the auroral oval diameter in real time as a function of the Kp index from the particle precipitation measured aboard Defense Meteorological Satellites DMSP. For the Q index needed to drive the auroral algorithm in the AWS polar ionospheric model, Hardy determined a relation between the Kp and the Q index. The analysis indicates that the auroral oval index Q computed from the AWS-K is overestimated. A least-squared deviation circle is fitted to the data base used in the Hardy algorithm. Using a four-year data set of Kp and Q observations, a new relation between the planetary magnetic activity index Kp and Q is determined to rectify this overestimation of the Q index. The new relation is Q0.964 Kp-0.3 for Kp2 and 02.04 Kp-2.7 for Kp2 . The improved, more precise Q values obtained from this relation will improve prediction of the auroral oval phenomena that affect the performance of the real time operational systems.
- Atmospheric Physics