More Archivelog generation at a particular time?

Dear Experts,
OS-SOlaris
DB version=9.2.0.6
our database is generating more archive logs in night between 2Am and 3AM.During this period no jobs are scheduled to run either from OS or from database itself.i want to invistigate what makes database to genetate more archivelog at this time.what i have to do to know the reason for more archive log generation.
Thank You All

Do you do hot backup during night? If you found entries like 'ALTER TABLESPACE xxx BEGIN BACKUP' before 2am and entries like 'ALTER TABLESPACE xxx END BACKUP' after 3am in your alert.log, that is the key.

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