ESCs are internationally distributed centers of expertise focused on a specific domain. They consist of a Coordinating Expert Group and a number of participating Expert Groups. The current ESCs are th
e following: Heliospheric Weather ESC (H-ESC) Solar Weather ESC (S-ESC) Space Radiation Environment ESC (R-ESC) Geomagnetic Conditions ESC (G-ESC) Ionospheric Weather ESC (I-ESC)
The date and time when a resource is nolonger available. If the Expiration Date is specified then it indicates thatresource should not be made available after that time. However, this is onlyadvisory
and in practice a resource description should be unpublished toeliminate access to a resource.
a unit of data (considered as a mass noun) that is assigned an identity constraint and is described by metadata that is deposited in a catalog to make that data available for discovery and re-use
The explosive processes that are believed to occur in supernovae. Explosive carbon burning occurs at a temperature of about 2 x 10^9 degrees and produces the nuclei from neon to silicon. Explosive oxy
gen burning occurs near 4 x 10^9 degrees and produces nuclei between silicon and calcium in atomic weight. At higher temperatures, still heavier nuclei are produced.