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Date: 09/05 (Thu)
Time: 14:45-16:30
Place: Cosmo Studio
Speaker: Torabi Kanbiz

Title:
Estimation of correlation between electronic properties of lightning and Earth’s internal/external factors


Abstract:
Climate change and global warming is generally thought to be caused by anthropologic carbon dioxide emissions. However, some of studies indicate that other factors affect to climate change and global warming such as cosmic ray, eccentricity of Earth’s revolution orbit, inclination of the Earth’s axis and precession of Earth. However, some of studies was using cloud cover change as parameter of Earth, even though it is not a uniform indicator. Because, the impact on the Earth is different depending on the altitude of the clouds.

If we use lightning, we can overcome this issue. Lightning is caused by strong updraft (it occurs when surface of Earth is heated). By using this lightning properties, we can pick up thundercloud from all clouds. In this study, we will use extremely low frequency range (ELF) which is provided by global ELF observation network (GEON). Devices are installed in Antarctica (Syowa base), Japan (Onagawa) and Sweden (Esrange). In addition, Time of Arrival method (TOA) is using in this study for estimate lightning positions. And also, we decided to use two thresholds. One is the threshold for the peak amplitude of the waveform of the sum of squared magnetic field, the other is the threshold for the rise before the peak amplitude of the sum of squared magnetic field waveforms. The former threshold is 3.5 times the average of one minute standard deviation in September 2010, the latter threshold is 2.5 times the average of one minute standard deviation in September 2010.

We will use not only lightning frequency but also electronic properties of lightning such as Charge Moment Change (CMC). Then, we will analyze what kind of factor is affecting thundercloud by using electronic properties of lightning as an  index of Earth.
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