Corrupted Redolog file and no backup

[bang_dba]

hi
i am getting following errors


SQL> alter database clear logfile group 2;
alter database clear logfile group 2
*
ERROR at line 1:
ORA-01624: log 2 needed for crash recovery of thread 1
ORA-00312: online log 2 thread 1: 'D:\ORADATA\LOG\LOG02.LOG'


SQL> alter database clear unarchived logfile group 2;
alter database clear unarchived logfile group 2
*
ERROR at line 1:
ORA-01624: log 2 needed for crash recovery of thread 1
ORA-00312: online log 2 thread 1: 'D:\ORADATA\LOG\LOG02.LOG'