Re: BSTAR value

From: T. Djamaluddin (
Date: Fri Apr 23 2004 - 06:08:50 EDT

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    Dear all,
    I have just open the e-mail after 3 days off, sorry to be late.
    As part of my research, I have analysed  long term TLE (1959 - 2004) of 
    several objects. I found that the variation of BSTAR similar to F10.7 cm of 
    solar activity (~11 yr cycle). I will analyse the correlation with the 
    geomagetic Ap indeces. The atmospheric drag (indicated by BSTAR) is affected 
    by both solar and geomagnetic activity. The ~20 days variation of BSTAR (I 
    found > 20 days) is related to solar and geomagnetic variation (the plots of 
    BSTAR dan F10.7 are similar).
    Thomas Djamaluddin
    National Institute of Aeronautics and Space (LAPAN), Indonesia
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