Electric Field Mill

17 March 2017

An electric field mill constructed using 3D printed and metallic off-the-shelf parts. It is powered by an Arduino and currently runs on a Raspberry Pi 2 that serves as a data logger.

M. J. Peterson

Mapping Lightning Flashes from Orbit

16 March 2017

Lightning imagers on satellites are useful for measuring total lightning production with a high detection efficiency. They can also be used to document the evolution of individual lightning flashes and probe their structure in some cases. This study uses Lightning Imaging Sensor (LIS) measurements to identify what level of spatial and temporal development that can be detected by lightning imagers.

M. J. Peterson, S. Rudlosky, and W. Deierling

Journal of Geophysical Research, PREPARING SUBMISSION

Picture Caption: 

Example LIS Flash with Branching. Event pixels and group centers in a convective-to-stratiform flash. Greyscale: LIS group number (grey: first, white: last)

The Evolution and Structure of Exceptional LIS Lightning Flashes

16 March 2017

The World Meteorological Organization (WMO) recently accepted new records for the longest length and longest duration of a single lightning flash. These record flashes were observed by Lightning Mapping Array (LMA) systems that monitor the VHF radio band for atmospheric sources. Lightning imagers provide a differing view on the properties and evolution of the flash. What are the flash extremes in the properties of optical lightning flashes?

M. J. Peterson, S. Rudlosky, and W. Deierling

Journal of Geophysical Research, FINALIZING SUBMISSION

Picture Caption: 

Example LIS Superbolt. Event pixels and group centers in a superbolt with continuing current. Greyscale: LIS group number (grey: first, white: last)

Reconstruction of the Broader Tropical Chimneys using TRMM-Retrieved Wilson Currents

16 March 2017

The baseline 20 km run of the Peterson et al. (2015) electric field retrieval algorithm on the Tropical Rainfall Measuring Mission (TRMM) dataset is used to rank the three tropical chimney regions. Unlike previous studies that have looked only at land-based thunderstorms, we consider thunderstorms and Electrified Shower Clouds (ESCs) in land and ocean regions across longitude quadrants that encompass each of the three chimneys – the Americas, Africa, and Asia – and the Pacific Ocean.

M. J. Peterson, W. Deierling, C. Liu, D. Mach, and C. Kalb

Geophysical Research Letters, PREPARING SUBMISSION

Picture Caption: 

Diurnal Cycle of Total Mean Current. Distributions of total mean Wilson currents across the tropics (solid, thick), the Americas (solid, thin), Africa, (dot-dashed), Asia (dashed), and the Pacific (dotted).

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