<div dir="auto">I think it is more like LF, or in the lowest HF band. But that was a very rare event. Gamma ray bursts usually only disturb the upper half of the ionosphere. This one reached out and touched the lowest level. Somebody's day got really screwed up 2 billion yrs ago or so. 🤣🤣🤣🤣</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 15, 2023, 2:12 PM TimC <<a href="mailto:k1dc.radio@gmail.com">k1dc.radio@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>

  
    
  
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    <font face="Verdana">Oh, great...  something else to mess with HF
      propagation.  ;-)<br>
      <br>
      T.<br>
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    <div>On 15-Nov-23 4:48, Juan Jiménez wrote:<br>
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          <div dir="auto"><a href="https://www.esa.int/Science_Exploration/Space_Science/Integral/Blast_from_the_past_gamma-ray_burst_strikes_Earth_from_distant_exploding_star" rel="noreferrer noreferrer" target="_blank">https://www.esa.int/Science_Exploration/Space_Science/Integral/Blast_from_the_past_gamma-ray_burst_strikes_Earth_from_distant_exploding_star</a> </div>
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    <div>-- <br>
      <p style="font-family:Verdana,Geneva,sans-serif;font-size:10px">Courageously
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                      <h3>Tim Carter - K1DC (was KC1RET)</h3>
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                            <td><a href="tel:1.978.710.0133" target="_blank" rel="noreferrer">+1.978.710.0133</a></td>
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                            <td><a href="mailto:kc1ret.radio@gmail.com" target="_blank" rel="noreferrer">k1dc.radio@gmail.com</a></td>
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              <p>"Computers are incredibly fast, accurate and stupid;
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                  Einstein</i></p>
              <p style="font-family:Verdana,Geneva,sans-serif;font-size:10px">Warning:
                Spelling errors in this message are the product of a
                poor school system. Pay teachures more than athletes.<br>
                IMPORTANT: This email is intended for the use of the
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