However, in addition to lightning in the troposphere, there are kinds of lightning discharges which occur above the thunderstorms. Up to now, lightning discharges above storms include sprite, elves (Emissions of Light and VLF perturbation due to EMP Sources, elves), Blue jet and Gigantic jet etc, and all of these discharges are totally named as Transient Luminous Events (TLEs). Gigantic jets were observed in America, Taiwan and Europe regions. Gigantic jet is sporadic compared with sprite, elves etc. Is there gigantic jet in middle latitude region in mainland China?
This images shows: (a) Observed gigantic jet in this paper; (b) Gigantic jet producing storm A and five sprite producing storm B. The two yellow lines represent the range of the line-of-sight extending from the observation site, that is, the camera field of view (FOV). The pink line is the gigantic jet azimuth in the camera FOV.
Credit: ©Science China Press
A recent study entitled "A gigantic jet event observed over a thunderstorm in mainland China", has been published in Chinese Science Bulletin, 2012, Vol 57(36). Detailed analysis of the observed gigantic jet and its associated storm were analyzed by using multiple data sets including low-light level observation, lightning location network, Doppler radar data and infrared weather images. This report was accomplished by the corresponding author Jing YangCa research associate from Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences.
Gigantic jet is a kind of large transient discharge which occurs above thunderstorms. It initiates from the thundercloud top and develops upward to the ionosphere, and connects the thunderstorm and ionosphere directly. Previous studies show that gigantic jet is often observed in tropical or subtropical regions, sometimes over winter thunderstorms. Is there gigantic jet in middle latitude region in mainland China? In addition, previous studies show that gigantic jet and sprites often occurred over the same storm. Is there any special case except this?
A gigantic jet event observed in middle latitude region in mainland China was first reported. The results show that the gigantic jet has tree-like shape, and the gigantic jet producing storm center located at about 35.6‹N, 119.8‹E. Different from other study that sprites and gigantic jets were produced by the same storm, two different storms produced two types of TLEs, that is, the gigantic jet producing storm produced only one gigantic jet event during its lifetime and five sprites were produced over another storm in this study. Also different from results in other studies that positive CGs dominated during a time period centered at gigantic jet, negative CGs dominated during a time period centered at the gigantic jet event and during most of the time in storm life in this study.
Gigantic jet starts from the thundercloud top and propagates upwards to the ionosphere, and it has a direct influence on the ionosphere potential and the electrical environment in the near space. Studies on this kind of discharge will provide an important protection for the space environment.Contact: Yang Jing
Science China Press Co., Ltd. (SCP) is a scientific journal publishing company of the Chinese Academy of Sciences (CAS). For 50 years, SCP takes its mission to present to the world the best achievements by Chinese scientists on various fields of natural sciences researches. http://www.scichina.com/
Yan Bei | EurekAlert!
NASA sees heavy rain in Tropical Cyclone Chan-Hom
02.07.2015 | NASA/Goddard Space Flight Center
Creating a stopwatch for volcanic eruptions
02.07.2015 | Arizona State University
Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.
The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...
New technique combines electron microscopy and synchrotron X-rays to track chemical reactions under real operating conditions
A new technique pioneered at the U.S. Department of Energy's Brookhaven National Laboratory reveals atomic-scale changes during catalytic reactions in real...
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and a half billion years ago.
Think of an object made of iron: An I-beam, a car frame, a nail. Now imagine that half of the iron in that object owes its existence to bacteria living two and...
A team of scientists including PhD student Friedrich Schuler from the Laboratory of MEMS Applications at the Department of Microsystems Engineering (IMTEK) of...
The three-year clinical trial results of the retinal implant popularly known as the "bionic eye," have proven the long-term efficacy, safety and reliability of...
25.06.2015 | Event News
16.06.2015 | Event News
11.06.2015 | Event News
03.07.2015 | Press release
03.07.2015 | Agricultural and Forestry Science
03.07.2015 | Health and Medicine