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New research reveals invisible meteors

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Daniel Kastinen’s paper presents results that pave the way for future and cross-disciplinary research not only on meteors, but also on space debris and near-Earth asteroids. Credit: Martin Eriksson / Daniel Kastinen (Illustration)

A new paper from the Swedish Institute for Astrophysics and Umeå University presents a unique method for analyzing radar data and meteoroid simulations in the solar system. This method has been applied to confirm the presence of rare high-altitude meteors and to measure space debris from the Kosmos-1408 satellite. On November 25th, Daniel Kastinen defends his doctoral dissertation.

“My main goal was to carefully analyze the meteor’s radar readings. space debris Evaluate the accuracy of the measurements. This is to improve further analysis and use the results together with new dynamic simulations. This work paves the way for future research and enables interdisciplinary research not only on meteors but also on space debris and near-Earth asteroids,” says Daniel Kastinen.

Between 10 and 200 tons of material from space falls into the Earth’s atmosphere every day. It consists of dust-sized particles and larger material (meteorites). These particles originate from parent bodies such as comets and asteroids, so they date back to the time the solar system formed. When a meteorite hits the Earth’s atmosphere and burns up in the form of a meteor, the material disperses into the atmosphere. Most of these meteors are invisible, but can be detected by radar.

meteor shower prophecy

Through analysis of data from Japan’s MU radar, Daniel Kastinen has successfully confirmed the existence of rare meteors that occur at unusually high altitudes. A unique result as it has been presented but no reliable verification of meteor height has been done. How incident particles generate meteors at high altitudes, where the atmosphere is very thin, is a topic of current debate.

Another part of the paper highlights the October Draconid simulation. Meteor showerDaniel Kastinen describes an unexpectedly strong meteor shower outburst in 2011-2012 and predicted a 2018 outburst. Subsequent work provided a rigorous basis for developing this type of simulation to more accurately predict such meteor showers.

Daniel Kastinen also used the scientific organization EISCAT’s radar system to measure space debris. This was made last November when the malfunctioning satellite Kosmos-1408 was destroyed by a Russian missile during a so-called anti-satellite test. could be estimated. He also presents a method for determining the trajectory of space objects. This research will improve our understanding of the near-Earth space environment and contribute to mapping the growing amount of space debris.

Tracking Near-Earth Asteroids

Asteroids is another current research topic contributed by Daniel Kastinen.by simulating the motion of asteroids and how they reflect radio wavesDaniel demonstrated that the EISCAT 3D radar system currently being built in northern Scandinavia can study near-Earth asteroids.

of radar The system can track near-Earth asteroids that could collide and damage the Earth’s surface. Of particular interest is the possibility of discovering asteroids, so-called minimoons, that are temporarily captured by Earth’s gravity. According to simulations, up to 1,000 meter-sized minimoons temporarily orbit the Earth each year, but only a few have been spotted so far.

“I look forward to continuing and developing my research. There are many interesting studies being done using new analytical methods. For example, tracking where meteoroids came from and Find out where the body came from. interstellar space As well as discovering new dust streams in our solar system, outside our solar system. We also hope to use this method to more accurately predict meteor showers and contribute to our understanding of how celestial bodies change in the Earth. solar system Move and evolve,” says Daniel Kastinen.

For more information:
Theory: From Meteors to Space Safety: Dynamic Models of Space Objects and Radar Measurements

provided by
Umeå University

Quote: New Research Reveals Invisible Meteors (22 November 2022), 22 November 2022 https://phys.org/news/2022-11-reveals-invisible-meteors .html

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