Time-weighted accumulations ap(tau) and Kp(tau)

Details Time-weighted accumulations ap(tau) and Kp(tau) Time-weighted accumulations ap(tau) and Kp(tau)

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...9012422w&link_type=abstract

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Physics

Geophysics

Accumulations, Geomagnetism, Temporal Distribution, Time Functions, Weighting Functions, Geophysics, Magnetic Storms, Plasma Diagnostics, Space Plasmas

Scientific paper

The planetary geomagnetic indices Kp and ap used in space geophysics are discussed. They provide an estimate of maximum magnetic perturbation within a 3 hr period. Many geophysical properties are clearly related to the indices, through energy transfer form a common disturbance source, but direct correlation is often lacking because of poor matching between the frequency of sampling and the physical response functions. The index ap (tau) is a simple accumulation of the linear ap calculated with an attenuation factor tau included to take account of natural temporal relaxation. The case for ap (tau) and the related Kp (tau) is made using applications to the variability of the plasma environment in the ionosphere and inner magnetosphere. These examples of improved correlation suggest that time-weighted integration might profitably be applied to other indices.

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