A student pilot performed two landings at the airport with a flight instructor aboard the airplane before the student pilot attempted a solo landing on runway 23. Upon touchdown during the solo flight, the airplane turned into the wind and veered off the left side of the runway where it struck a visual approach slope indicator. The wind was reportedly from 170 degrees at 5 knots at the time of the accident. Examination of the airplane revealed that the flaps were fully extended. The airplane sustained substantial damage to airframe underlying the main landing gear attachment.