FROM: 	Piet Martens, ESA SOC
To:  	SOHO Community
Date: 	22 August 1996
Subj: 	KEYWORD NUMBERS FOR COORDINATED OBSERVATIONS


In response to a recent SWT decision, starting 22 August 1996 SOHO joint 
observations (JOP runs, Intercals, collaborations, and campaigns) have been 
assigned a unique number from their very first appearance in the planning 
process, i.e. the SOHO calendar. See there, or under point 4 of these minutes 
for examples. This number  will be used in the experiment IAP's, and therefrom 
propagate into the as-run database and the catalogues, as well as to the headers 
of the FITS files.

This way all the information pertaining to one campaign is linked from the 
beginning of the data pipeline all the way into the archive, for the benefit 
of future archive users.

Note that the archive user does not need to know a priori the exact  number of 
the campaign in order to get access to the data; the point is that the 
information is linked internally through the campaign number. For example, a 
future user may do a search for runs of JOP048 in August 1996, therefrom retrieve 
the campaign number(s) for each of of the runs, and then use that to retrieve the 
data.

The SOC has assigned numbers to the activities that are currently on the 
calendar. The numbers 0-199 have been reserved for past joint observations.  
Since there is a large degree of arbitrariness in what constitutes a 
"campaign", a great degree of flexibility has been used in assigning numbers; 
only multiples of 10 have been used, starting from 200. Thus, when the leader 
of a JOP or campaign decides that the "campaign" at hand really constitutes a 
number of different campaigns, she or he is at liberty to assign up to 10 
sequential numbers starting from the original one. On the other hand, when 
several joint observations with different numbers really constitute one 
campaign, the leader can decide to stick with the first number. 

Obviously any changes in the numbers assigned to joint observations should be 
communicated clearly and early in the process to the SOC and the daily 
meeting.