investigations With Randall Paton and Sabrina Myburgh httpswwwamsmeteorsorg202302meteoractivityoutlookforfebruary11172023 Example of Chelyabinsk bolide httpswwwyoutubecomwatchvEhNLYJFxOM ID: 1021436
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1. Shocking ObjectsMeteors, shock waves, and investigationsWith Randall Paton and Sabrina Myburghhttps://www.amsmeteors.org/2023/02/meteor-activity-outlook-for-february-11-17-2023/
2. Example of Chelyabinsk bolidehttps://www.youtube.com/watch?v=EhNL-YJFxOM
3. Big BangsWhat is a bang?What is a thunderclap?What is a whip crack?What is a sonic boom?All of these are big jumps in pressure which our brains hear as a “bang”We call these SHOCK WAVEShttps://www.facebook.com/christosmithphotography/photos/a.788224414629607/3631925710259449/?type=3&ref=embed_post
4. Shock WavesObjects moving supersonically (faster than the speed of sound)Shock waves move the air out of the way but also cause the pressure to jumpHow fast is sound speed?About 1 250 km/h!Depends on temperaturehttps://www.eoas.ubc.ca/courses/atsc113/flying/met_concepts/03-met_concepts/03a-std_atmos/index.html
5. Viewing the InvisibleWe can see these effects but it is difficult to do soEverything moves fast, so we use high-speed camerasDirection-indication Schlieren imaging at 5 000 frames per second[video redacted]
6. Hearing the InvisibleWe can hear shock waves as booms and bangsThis can help us figure out where they are goingWe live in a time where always-on cameras are everywhere (security, doorbells, dashcams…)How do we synchronise everything?[image redacted]
7. What about Meteors?12 – 40 km/SECOND when they hit the atmosphereHigh heating and pressure → surface melting & high stress → breaking into droplets or terminal burstTunguska event in 1908 flattened 80 million trees over an area of 2 150 km2Detected in US, UK, Indonesia…Encyclopædia Britannica. (2023). Tunguska event. URL: https://www.britannica.com/event/Tunguska-event#/media/1/609132/112402
8. What about Meteors?Although relatively small, these carry LOTS of kinetic energyMeteorites are difficult to find because a lot burns away before it hitsSometimes they don’t even necessarily hit (e.g. Tunguska meteor is contested as a “flythrough event”)Daniil E Khrennikov and others, On the possibility of through passage of asteroid bodies across the Earth’s atmosphere, Monthly Notices of the Royal Astronomical Society, Volume 493, Issue 1, March 2020, Pages 1344–1351, https://doi.org/10.1093/mnras/staa329
9. What about People?Could get incinerated, burned, or struck with debrisBiggest risk is barotraumaInjury due to high pressureCan happen far away from the meteor impact site because of the speed of the meteor (strength of the wave)Traumatic brain injury[image redacted]
10. Can I See One Myself?https://blogs.esa.int/rosetta/2014/10/03/measuring-comet-67pc-g/
11. Shocking ObjectsMeteors, shock waves, and investigationsWith Randall Paton and Sabrina Myburghhttps://www.amsmeteors.org/2023/02/meteor-activity-outlook-for-february-11-17-2023/