“Given these evidences, we contend that there is a direct influence of ablating meteoroids on the topside of the mesospheric metal layer.”

“Oscillations of 2 to 3 days period are found in February and March in the mesospheric emissions.”

“Polar mesospheric clouds are thin layers of nanometer-sized ice particles that occur at altitudes between 82 and 87 kilometers in the high-latitude summer.”