Thank you for rgin response
Actually I could do what I wanted as follows.
Inside the controller was the tab "Configuration" and then "loggining" there pointed to my external server log indicating the "category" (user) and "severity" (notifications) as in figure "1" attached.
Soon after I went in and gave the CLI command "configure terminal" and then "logging level user notifications authmgr process" as I had read in an old post cjoseph and everything worked as I would like.
The output line that I hoped it was for my external syslog was exactly this:
Sep 11 18:50:11 2014 CWF-CS.cc0507 authmgr [2054]: <522008> <NOTI> <CWF-CS.cc0507 10.2.XX.XX> Successful User Authentication: username = P_119596 MAC = 64: b3: 10 : XX: XX: XX IP = 172.XX.XX.XXX ROLE_POS_CD_INTERNET role = VLAN = 353 AP = LAB-EN-02-INTERNET SSID = CD = AAA profile AAA_CD_INTERNET auth method = 802.1x auth server = RADIUS_PRI_CD_INTERNET
Thanks for everyone's help.