Fig. 8From: A quasi-27-day oscillation activity from the troposphere to the mesosphere and lower thermosphere at low latitudesWavelet spectra of daily mean GW energies at a, c 1–9 km and b, d 20–28 km derived from radiosonde observations. a, b Represent the spectra of GW energy averaged between Hilo and Kauai, and c, d represent the spectra of GW energy in Pago PagoBack to article page