-- card: 30611 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 4601
-- name: #91
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on openCard
  global group,rightone
  put 9 into group
  put "B" into rightone
  pass openCard
end openCard



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Question #9

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3BC-5.1 Over what periods of time do sudden ionospheric disturbances normally last?

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The entire day

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A few minutes to a few hours

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A few hours to a few days

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Approximately one week