It is widely believed that gravity waves trigger the occurrence of F-region irregularities. This inference of gravity wave seeding the irregularities was based on the Range-Time-Intensity maps of the incoherent scatter radar echoes. The radar-returned echoes of F-region irregularities are in the form of waves, with periodicities ranging from 60 minutes to 120 minutes. But, till this date no measurements have been carried out before the irregularities are actually triggered ...
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