Standard level for computing the D st index

Details Standard level for computing the D st index Standard level for computing the D st index

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ge%26ae..16..379g&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 16, Mar.-Apr. 1976, p. 379-381. In Russian.

Statistics

Computation

Diurnal Variations, Magnetic Disturbances, Standards, Earth Magnetosphere, Geomagnetic Latitude, Indexes (Ratios), Solar Activity Effects

Scientific paper

Sugiura (1964) proposed the following formula for calculating the geomagnetic disturbance D st index: D st (t) = H(t) H sub 00 (bar) - Sq (t) (bar) - delta H sub 0 (bar), where the bar signifies averaging according to low latitude station data; H sub 00, the average yearly value of the H-component; Sq (t), the average solar-diurnal variation on quiet days; delta H sub 0, the constant for the given year, which determines the zero level of computation of the D st index. The paper attempts to determine the standard level for computing the D st index on the basis of the following considerations: (1) the average yearly value of the H component of the previous year is used for the value of H sub 00; (2) delta H sub 0 is also determined from the previous year or completely excluded; and (3) the standard Sq (bar) variation calculated for each month by averaging the data of low latitude stations for a series of years is used as the averaged Sq (t) (bar).

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