Archive Logs using more Space

May be you can help me out.
I have resized my redo logs, and when I checked my file system the log switchs were less frequent as expected, however if compared to the same period when the redo logs were smaller(1 hour earlier) the archive logs (db in archive log mode) had doubled the usual capacity on the file system.
Now Im sure Im being stupid here.
I had expect the file system usage would be the same but have bigger but fewer archive logs. I am sure the through put is the same. Is my theory correct, even through the facts are not matching up?

Thanks for confirming my thoughts. I was very surprised when the file system usage had changed and the last change was redo log size adjustment.
It is one of though times when you were the last to touch it and somthing is different you get the blame.
I suspect some process is being run that is generally not start at this time of day. just an unfortunate coincidence.
thanks I thought I was going mad.

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