TY - JOUR
T1 - The first electric field pulse of cloud and cloud-to-ground lightning discharges
AU - Azlinda Ahmad, Noor
AU - Fernando, M.
AU - Baharudin, Z. A.
AU - Rahman, M.
AU - Cooray, V.
AU - Saleh, Ziad
AU - Dwyer, Joseph R.
AU - Rassoul, Hamid K.
N1 - Funding Information:
We would like to thank all the staff members of Vero Beach Marine Laboratory (VBML), Florida, especially Dr. Dong Zhang and Prof. Junda Lin for their facilities and excellent support during the measurement campaign. This work was funded by grants from the Swedish Foundation for International Cooperation in Research and Higher Education (STINT) grant IG2004–2031 and Swedish Research Council , grant 621-2006-4299 . Financial assistance from International Science Programs (ISP), Uppsala University, Sweden to support Mahendra Fernando during his stay in Uppsala, Sweden is highly acknowledged. This work also was supported in part by NSF grant ATM 0607885 .
PY - 2010/2
Y1 - 2010/2
N2 - In this study, the first electric field pulse of cloud and cloud-to-ground discharges were analyzed and compared with other pulses of cloud discharges. Thirty eight cloud discharges and 101 cloud-to-ground discharges have been studied in this analysis. Pulses in cloud discharges were classified as 'small', 'medium' and 'large', depending upon the value of their relative amplitude with respect to that of the average amplitude of the five largest pulses in the flash. We found that parameters, such as pulse duration, rise time, zero crossing time and full-width at half-maximum (FWHMs) of the first pulse of cloud and cloud-to-ground discharges are similar to small pulses that appear in the later stage of cloud discharges. Hence, we suggest that the mechanism of the first pulse of cloud and cloud-to-ground discharges and the mechanism of pulses at the later stage of cloud discharges could be the same.
AB - In this study, the first electric field pulse of cloud and cloud-to-ground discharges were analyzed and compared with other pulses of cloud discharges. Thirty eight cloud discharges and 101 cloud-to-ground discharges have been studied in this analysis. Pulses in cloud discharges were classified as 'small', 'medium' and 'large', depending upon the value of their relative amplitude with respect to that of the average amplitude of the five largest pulses in the flash. We found that parameters, such as pulse duration, rise time, zero crossing time and full-width at half-maximum (FWHMs) of the first pulse of cloud and cloud-to-ground discharges are similar to small pulses that appear in the later stage of cloud discharges. Hence, we suggest that the mechanism of the first pulse of cloud and cloud-to-ground discharges and the mechanism of pulses at the later stage of cloud discharges could be the same.
KW - Cloud discharges
KW - Electric field pulses
KW - Electromagnetic field
KW - Lightning
UR - http://www.scopus.com/inward/record.url?scp=74149094791&partnerID=8YFLogxK
U2 - 10.1016/j.jastp.2009.11.001
DO - 10.1016/j.jastp.2009.11.001
M3 - Article
AN - SCOPUS:74149094791
SN - 1364-6826
VL - 72
SP - 143
EP - 150
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
IS - 2-3
ER -