I'm sure that you meant that the archived redo logs are on the same disk volume as the SYSTEM tablespace. It is impossible for them to actually be in the SYSTEM tablespace.
You can move these archived redo logs to any location you want. Just make sure that your LOG_ARCHIVE_DEST parameter is pointed to this location. If you should require recovery and these logs, you can specify the new location at that time. Otherwise, I wouldn't worry about them.
Finally, keep in mind that your archived redo logs before your last backup are not needed to recover from that backup and roll forward in time. So you can remove those archived redo logs if you want.
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This was first published in August 2003