Abstract
Tweek atmospherics are Extremely Low Frequency (ELF) and Very Low Frequency (VLF) radio waves produced by lightning discharge. For few decades, tweeks has been known to be useful in measuring the variations of the lower region of the ionosphere (D-region). However, due to the nature of lightning occurrences, it is difficult to determine the location of source for the tweeks signal. In this study, we determine the source location of the tweeks by accurately measuring the time of the lightning impulse. The source locations are based on lightning information by the World Wide Lightning Location Network (WWLLN). A nighttime sample of tweeks were collected on the 11 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> November 2010 shows tweeks were found to have ±600 km in difference between the calculated lightning propagation distance and the location found in the WWLLN lightning activity. Next, this study shows the variations of the D-region ionosphere using tweeks with the known source locations.
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