SPICE is an ancillary information system thatprovides scientists and engineers the capability to include space geometryand event data into mission design, science observation planning, andscience data
analysis software. The staff of the NASA Navigation andAncillary Information Facility, NAIF, which is located at JPL provides SPICEsupport for planetary, heliophysics, and Earth science missions, seehttps://naif.jpl.nasa.gov/naif/index.html. This SPICE has been adapted fromtext on NAF hosted web pages.
1. A spike of ice formed during the freezing of a water drop or a contained volume of water (as in a puddle or freezer container); expansion of the inward freezing ice expels any remaining water throu
gh a weak point in the shell which then freezes as a spike in the colder environment. 2. Bright spike of luminous gas extending from the chromosphere into the corona of the sun. Spicules are several hundred kilometers in diameter and extend outward 5000-10 000 km. Observed in photographs of the limb, these features have a lifetime of several minutes.
Rapidly changing, predominantly vertical, spike-like structures in the solar chromosphere observed above the limb. Spicules appear to be ejected from the low chromosphere at velocities of 20 to 30 km/
s, reaching a height of about 9000 km and then falling back or fading. The total lifetime is 5 to 10 minutes.