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Tunguska and the ionosphere

  1. Jun 17, 2008 #1
    The tunguska event has no precedent in recent human history.If it did have one we would have heard in folklore of tidal waves,forests being flattened,towns,cities etc.There would even be craters in the ground formed recently.Did humans do something that enabled tunguska to happen.I have heard that because of human activities the atmosphere has been warming for at least 200 years.Has this warming changed the earth's magnetic field by affecting the ionosphere.And could the magnetic field have then attracted a large meteor with a high iron content for example (iron being attracted by magnetism).Could any other (non magnetic) change in the ionosphere allow more meteors to strike the earth , particularly the bigger ones.If the earth's atmosphere as a whole reflected less light back into space would the reduction in pressure of radiation on rocks in space (tending to push them away from Earth very slightly) encourage more to fall to Earth? People have taken a lot of iron out of the ground and spread it all over the world.How has this affected the Earth's magnetic field?
    Last edited: Jun 17, 2008
  2. jcsd
  3. Jun 17, 2008 #2
    No. https://www.physicsforums.com/showthread.php?t=239580", it was a meteoroid.
    No. The earth is not a magnet is that sense.
    Um, what? .. no..
    Earth magnetic field is generated by it molten core, not the iron ore that is mined.
    Last edited by a moderator: Apr 23, 2017
  4. Jun 18, 2008 #3


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    Meteor impacts are not that unusual, ok? Just search 'impact crater' in Google. The smaller ones will be harder to identify in history because the marks they leave will be minuscule, but this doesn't mean they didn't happen in the past. There is no confirmed crater or impactor identified for Tunguska, so do you really think it'd be that hard to miss a similar event that happened longer ago? After the trees regrew (if there even were trees) there wouldn't really be any record of it happening. I don't know why you have to invoke all these special circumstances to explain something like this...
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