The j002 ones are from the jobs run via dbms_job as defined by job_queue_processes.

It sounds to me like you've got some jobs that are submitted via dbms_job (check dba_jobs) that could have tracing turned on as part of the SQL or PL/SQL code.

Do the trace files contain SQL? (Run tkprof against them and look at the output)

Search the tkprof output for "trace" or "alter session"