Magnetic Storm Onset SD

Introduction

A solar terrestrial physicist wishes to find and model magnetosphere data observed during magnetic storms. Magnetic storms are defined as time intervals where the DST index drops below some user-defined limit.

Flow of Events

First, the physicist searches the resource catalogue for all catalogues containing DST index information. A list of catalogues is returned, and the physicist selects one or more of the DST catalogues to query for time intervals where the DST index is greater than some user-defined limit. The catalogue returns a list of matching time intervals. Next, the physicist searches the resource catalogue for a list of magnetosphere models available to the Astrogrid. A list of models is returned, and the physicist selects the appropriate model. The physicist's third resource catalogue search returns a list of spacecraft with onboard magnetometer. Finally, the physicist can perform a complex query; for all DST index time intervals while the spacecraft magnetometer is turned on, the spacecraft metadata returns a list of magnetosphere regions observed. Magnetometer data for these regions is retrieved from the instrument data catalogue, converted to an appropriate coordinate system, and compared to the magnetosphere model selected earlier. The result set is returned to the physicist.

Sequence Diagram

UseCases:

These use cases are the ones that will be needed to deliver this case.

1. AuthenticateIdentity
2. PerformRegistrySearch
3. NegotiateAccessToResource
   • AuthenticateIdentity
   • DetermineAuthority
4. PerformCatalogueSearch
5. MySpaceStoreResults
   • NegotiateAccessToResource
     • AuthenticateIdentity
     • DetermineAuthority
6. ComplexQuery
   • NegotiateAccessToJob
7. DetermineModel
   • DetermineProgram
     • AccessLibraryFunction
       • NegotiateAccessToResource
         • AuthenticateIdentity
         • DetermineAuthority
     • AccessWebService
       • NegotiateAccessToResource
         • AuthenticateIdentity
         • DetermineAuthority
     • UploadUserCode
       • NegotiateAccessToResource
         • AuthenticateIdentity
         • DetermineAuthority
       • MySpaceStoreResults
         • NegotiateAccessToResource
           • AuthenticateIdentity
           • DetermineAuthority
     • NegotiateAccessToJob
8. MySpacePublishDerivedData

-- ElizabethAuden - 07 Jun 2002