Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Is there gigantic jet event in middle latitude region in mainland China?

11.02.2013
When talking about lightning, appearances of different lightning which occur along with thunderstorms will emerge in the minds of the people and these lightning occur in the troposphere.

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 YangCa 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
E-mail: yangj@mail.iap.ac.cn
See the article: YANG Jing, FENG Guili. A gigantic jet event observed over a thunderstorm in mainland China. Chinese Science Bulletin, 2012, 57(36): 4791-4800.

http://csb.scichina.com:8080/kxtbe/EN/abstract/abstract507387.shtml

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!
Further information:
http://www.scichina.org

More articles from Earth Sciences:

nachricht Researchers find higher than expected carbon emissions from inland waterways
25.05.2016 | Washington State University

nachricht Rutgers scientists help create world's largest coral gene database
24.05.2016 | Rutgers University

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Computational high-throughput screening finds hard magnets containing less rare earth elements

Permanent magnets are very important for technologies of the future like electromobility and renewable energy, and rare earth elements (REE) are necessary for their manufacture. The Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, Germany, has now succeeded in identifying promising approaches and materials for new permanent magnets through use of an in-house simulation process based on high-throughput screening (HTS). The team was able to improve magnetic properties this way and at the same time replaced REE with elements that are less expensive and readily available. The results were published in the online technical journal “Scientific Reports”.

The starting point for IWM researchers Wolfgang Körner, Georg Krugel, and Christian Elsässer was a neodymium-iron-nitrogen compound based on a type of...

Im Focus: Atomic precision: technologies for the next-but-one generation of microchips

In the Beyond EUV project, the Fraunhofer Institutes for Laser Technology ILT in Aachen and for Applied Optics and Precision Engineering IOF in Jena are developing key technologies for the manufacture of a new generation of microchips using EUV radiation at a wavelength of 6.7 nm. The resulting structures are barely thicker than single atoms, and they make it possible to produce extremely integrated circuits for such items as wearables or mind-controlled prosthetic limbs.

In 1965 Gordon Moore formulated the law that came to be named after him, which states that the complexity of integrated circuits doubles every one to two...

Im Focus: Researchers demonstrate size quantization of Dirac fermions in graphene

Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices

Quantum mechanics is the field of physics governing the behavior of things on atomic scales, where things work very differently from our everyday world.

Im Focus: Graphene: A quantum of current

When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene

In 2010 the Nobel Prize in physics was awarded for the discovery of the exceptional material graphene, which consists of a single layer of carbon atoms...

Im Focus: Transparent - Flexible - Printable: Key technologies for tomorrow’s displays

The trend-forward world of display technology relies on innovative materials and novel approaches to steadily advance the visual experience, for example through higher pixel densities, better contrast, larger formats or user-friendler design. Fraunhofer ISC’s newly developed materials for optics and electronics now broaden the application potential of next generation displays. Learn about lower cost-effective wet-chemical printing procedures and the new materials at the Fraunhofer ISC booth # 1021 in North Hall D during the SID International Symposium on Information Display held from 22 to 27 May 2016 at San Francisco’s Moscone Center.

Economical processing

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Networking 4.0: International Laser Technology Congress AKL’16 Shows New Ways of Cooperations

24.05.2016 | Event News

Challenges of rural labor markets

20.05.2016 | Event News

International expert meeting “Health Business Connect” in France

19.05.2016 | Event News

 
Latest News

LZH shows the potential of the laser for industrial manufacturing at the LASYS 2016

25.05.2016 | Trade Fair News

Great apes communicate cooperatively

25.05.2016 | Life Sciences

Thermo-Optical Measuring method (TOM) could save several million tons of CO2 in coal-fired plants

25.05.2016 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>