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!
A close-up look at an uncommon underwater eruption
11.01.2018 | Woods Hole Oceanographic Institution
Environmental history told by sludge: Global warming lets the dead zones in the Black Sea grow
10.01.2018 | Leibniz-Institut für Ostseeforschung Warnemünde
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
17.01.2018 | Ecology, The Environment and Conservation
17.01.2018 | Physics and Astronomy
17.01.2018 | Awards Funding