Automatic snapshot collection

We are on 11.2.0.3.0 and I don't see Oracle capturing snapshot every 1 hr on top of the hour. Is there some change in this feature as compared to 10g which used to capture every 1 hr on top of the hour ( by default )?

Thanks

Mukul

Enter value for num_days: 5

Listing the last 5 days of Completed Snapshots

                                                        Snap
Instance     DB Name        Snap Id    Snap Started    Level
------------ ------------ --------- ------------------ -----
PUBWEB       PWEB              39 03 Mar 2012 01:15      1
                                 40 03 Mar 2012 02:20      1
                                 41 03 Mar 2012 03:37      1
                                 42 03 Mar 2012 04:03      1
                                 43 03 Mar 2012 05:14      1

                                 48 04 Mar 2012 04:21      1
                                 49 04 Mar 2012 05:05      1
                                 53 05 Mar 2012 12:51      1
                                 54 05 Mar 2012 14:14      1
                                 55 05 Mar 2012 20:00      1
                                 56 06 Mar 2012 02:15      1
                                 57 06 Mar 2012 03:10      1
                                 58 06 Mar 2012 06:03      1
                                 59 06 Mar 2012 07:45      1
                                 60 06 Mar 2012 14:19      1
                                 61 06 Mar 2012 18:09      1
                                 62 06 Mar 2012 20:17      1
                                 63 06 Mar 2012 21:44      1
                                 64 07 Mar 2012 03:03      1

                                 65 07 Mar 2012 12:40      1
                                 66 07 Mar 2012 14:26      1