Re: BSTAR value

From: Tony Beresford (
Date: Tue Apr 20 2004 - 01:12:10 EDT

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    At 13:52 20/04/04, Thomas Fly wrote:
    >Would not the bulk of the ions from the sun be deflected by the earth's magnetic
    >field, since the ISS's orbit is well inside the Van Allen radiation belt?  Is
    >there some data that speaks to the relative effects of the earth's atmosphere at
    >the altitude of the ISS's orbit, vs. the solar wind?
    Thomas, The major solar cycle variation in atmospheric density is to the increase of
    electromagnetic radiation heating the upper atmosphere. This is all in the Ultaviolet,
    and gets absorbed at heights above 100Km. 
    During magnetic storms the increased flow of an an elecrtic current causes rapid changes
    in density because of the heating associated with the current flow.
    These days you can get daily measures of the solar ultraviolet flux, but the radio emmission
    at 22 cm is as good a proxy , as is the smoothed sunspot number.
    This was all discovered by middle 60s. Its covered quite adequately in King-Hele's 
    "Observing Earth Satellites"
    Tony Beresford 
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