Nothing to due with meteor showers. Possible solar flare activity on surface of sun. Sends high energy particles into space producing possible displays of Northern Lights, disruption to radio comms and possibly above normal levels of radiation at cruising altitudes.
Didn't Concorde have a radiation alert facility as cruise altitudes of FL600 or so meant less atmospheric absorption of solar radiation. If warning sounded immediate dscent to lower levels was required. Or did I just imagine that?