1. Earth Observatory of Singapore, Nanyang Technological University, Singapore, shjwei@ntu.edu.sg
2. Also at Agency for Meteorology, Climatology, and Geophysics (BMKG), Indonesia.
3. Department of Physics, Syiah Kuala University, Banda Aceh, Indonesia
4. Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Indonesia
5. Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Germany
6. Agency for Meteorology, Climatology, and Geophysics (BMKG), Indonesia
7. Also at Asian School of the Environment, Nanyang Technological University, Singapore.