Subscribe free to our newsletters via your
. 24/7 Space News .

Seismo-Ionospheric effects of 'Chelyabinsk' Meteorite revealed
by Staff Writers
Washington DC (SPX) Nov 28, 2014

EKB radar field-of-view and trajectory of meteorite 'Chelyabinsk', its explosion (1) and fall (2). Image courtesy Oleg Berngardt.

The meteorite that hit the Russian city of Chelyabinsk on Feb. 15, 2013, was the cause of a large number of dynamic ionospheric, atmospheric and seismic phenomena. Oleg Berngardt of the Institute of Solar-Terrestrial Physics in Irkutsk, Russia, presents the properties of ionospheric irregularities elongated with Earth magnetic field during the first 25 minutes after the impact.

The irregularities were observed by the EKB radar of Russian segment of the Super Dual Auroral Radar Network (SuperDARN), an international radar network for studying the upper atmosphere and ionosphere.

"It is shown that 40 minutes before meteor fall the EKB radar started to observe powerful scattering from irregularities elongated with the Earth magnetic field in the F-layer. Scattering was observed for 80 minutes and stopped 40 minutes after the meteorite fall," Berngardt writes in a paper.

The researcher reveals that during 9-15 minutes after the meteorite fall at ranges 400-1200 km from the explosion site a changes were observed in the spectral and amplitude characteristics of the scattered signal.

This features were the sharp increase in the Doppler frequency shift of the scattered signal corresponding to the Doppler velocities about 600 m/s and the sharp increase of the scattered signal amplitude.

"This allows us to conclude that we detected the growth of small-scale ionospheric irregularities elongated with the Earth magnetic field at E-layer heights," Berngardt explains.

"Joint analysis with the seismic data and numerical modeling shows that the observed effect is connected with the passage of secondary acoustic front formed by supersonic seismic ground wave from the 'Chelyabinsk' meteorite."

Significant ionospheric effects during the first 20-25 minutes after the fall at close distances from the explosion site (about 500-700km) were not investigated yet.

Joint analysis with the seismic data and numerical modeling presented in the paper, shows that the observed effect is connected with the passage of secondary acoustic front formed by supersonic seismic ground wave from the 'Chelyabinsk' meteorite in the presence of a sufficiently high background electric field. The secondary acoustic wave is formed a supersonic seismic ground wave caused by the explosion of a meteorite and its passage.

"As a possible explanation the growth of elongated ionospheric irregularities may be caused by the passage of the high-speed acoustic wave in the ionosphere in the presence of high enough background electric field," Berngardt concludes. "The mechanism of such gain of field-aligned E-layer ionospheric irregularities at the moment is not clear and requires detailed investigation."

The Chelyabinsk meteor was a superbolide caused by a near-Earth asteroid that entered Earth's atmosphere over Russia on Feb. 15, 2013 at about 03:20 UTC, with a speed of 40,000 - 42,900 mph. It quickly became a brilliant superbolide meteor over the southern Ural region.

The light from the meteor was brighter than the Sun, even at 100 km distance. It was observed over a wide area of the region and in neighbouring republics. Eyewitnesses also felt intense heat from the fireball.

Because of its velocity and shallow atmospheric entry angle, the object exploded in an air burst over Chelyabinsk Oblast, at a height of around 29.7 km (18.4 miles, 97,400 feet). The explosion generated a bright flash, producing a hot cloud of dust and gas that penetrated to 26.2 km, and many surviving small fragmentary meteorites, as well as a powerful shock wave.

Its explosion created panic among local residents and about 1,500 people were injured seriously enough to seek medical treatment. All of the injuries were due to indirect effects rather than the meteor itself, mainly from broken glass from windows that were blown in when the shock wave arrived, minutes after the superbolide's flash.

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only


Related Links
AstroWatch Blog
Asteroid and Comet Impact Danger To Earth - News and Science

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Watch the Leonid Meteor Shower light up sky Sunday into Monday
Hackensack, N.J. (UPI) Nov 16, 2014
One of the most anticipated meteor showers of the year is set to peak overnight tonight and all you have to do to see it is look up. Viewing the annual Leonid Meteor Shower will be somewhat dampened this year by a waning moon in Virgo. But in dark areas away from city lights, viewers can still expect to see plenty of the streaking lights across the sky. This year's show is expected to peak overnight Nov. 16 into Nov. 17, from late on Sunday night into the predawn hours on Monday. ... read more

Young Volcanoes on the Moon

Carnegie Mellon Unveils Lunar Rover "Andy"

Russia Preparing Joint Moon Exploration Agreement With EU

U.K. group to crowd-source funding for moon mission

Within Rover's Reach at Mars Target Area 'Alexander Hills'

Mars Exploration Program Director Named

Uwingu to Beam Almost 90,000 Messages to Mars

Second Time Through, Mars Rover Examines Chosen Rocks

DNA may survive suborbital spaceflight, re-entry

The International Space Station officially has an espresso machine

Orion Teams on Track Heading into Holiday

Lockheed Martin Keeps Fingers Crossed for Orion's First Test Flight

China Launches Second Disaster Relief Satellite

China expects to introduce space law around 2020

China launches new remote sensing satellite

China publishes Earth, Moon photos taken by lunar orbiter

Soyuz docks at Space Station; Expedition 42 joins crew

Italy's first female astronaut heads to ISS in Russian craft

Space station gets zero-gravity 3-D printer

NASA Commercial Crew Partners Continue System Advancements

Proton-M Carrier Rocket Launch Postponed Over Technical Problems

Soyuz Installed at Baikonur, Expected to Launch Wednesday

Elon Musk unveils 'drone ship' and 'x-wing' fins for rockets via Twitter

China launches Yaogan-24 remote sensing satellite

Hot, Super-Earths Help Track Water-Rich Atmospheres

How to estimate the magnetic field of an exoplanet?

Follow the Dust to Find Planets

NASA's TESS mission cleared for next development phase

Cooling with the coldest matter in the world

U.S. supplies Ukraine with counter-mortar radar systems

Versatile bonding for lightweight components

NASA's Van Allen Probes Spot an Impenetrable Barrier in Space

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.