Topical Issue - Space Weather Instrumentation
Open Access
Technical Article

Fig. 7

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Two top panels: curves involved in the procedure to obtain the Local Disturbance index (LDi) and the result for SPT data. Two bottom panels are equivalent for UAH-MAG data. Red curves are the solar regular variation fitting to the data, yellow lines are the adopted solar quiet curves, the blue line is an auxiliary curve for the calculations and the green line is the baseline considering secular variation.

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