While you certainly do not have to register to search the archive, download data, analyze data, and write a paper, you may wish to register.
The SOFIA Science Data Archive contains proprietary data, so you may want to register in order to get access to your SOFIA data. Contact the SOFIA Science Mission Office for access to your data. PIs of approved programs must give permission for others (e.g., collaborators) to have pre-release access to the data.
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