Alternate Definitions for Index

A set of derived variables frequently used to parameterise Space Weather conditions and as input to models. The default sets of indices are: Solar activity and geomagnetism: PC, AE, Ap, Kp, Dst, IG12, IMF, R, R12, F10.7, S10, E10, M10, Y10; Ionospheric scintillation: S4, sigma_phi, fading depth, fade duration, time between fades.

The location of an item in an array orvector. An index can be multivalued to represent the location in amultidimensional object. The index of the first item is "1". A value of "0"is a wild card for all elements at the location in an array. A value of "-1"is a reference to the dimension at the location in the array. A "-1" is usedwhen describing the attributes of the dimension, where as "0" or a positiveinteger is used to describe attributes of individual elements.