These plots show how long PIs have to wait to receive their data after a sequence has been observed. The total time is divided into three stages. The vertical scales on all three plots are in days and each point represents a three month average.
The top plot shows the time between the observation date and the date the raw telemetry is sent to GSFC. Sequences typically spend three to six weeks at ISAS while the attitude solution is calculated, the orbital parameters are determined, and the FRF files are produced.
The middle plot shows the amount of time a sequence spends in transit between ISAS and GSFC. Before the summer of 1998, data were mailed from ISAS to GSFC on DAT tape. This typically took one week. However, network improvements now allow us to transfer data electronically, almost eliminating this delay.
Finally, the bottom plot shows the amount of time a sequence spends at GSFC, between the date we receive the data and the date we mail the processed products to the PI. We are able to process and distribute most data within a week of receiving the telemetry.
Therefore, ASCA PIs should expect to receive their data within six weeks of the observation, although delays as long as 8-10 are possible.
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