A period for the multiple flares by ENVISAT and ALOS

From: alain.figer@club-internet.fr
Date: Sun Aug 05 2012 - 11:42:24 UTC

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    A period for the multiple flares by ENVISAT and ALOS
     
    . ALOS 2006-02 A
    During many of its passes, ALOS exhibits one or several Iridium-like 'flares'. That's rather obvious to find a rough period. In July, I derived visually a period of 50-52 sec between light maxima. The flare magnitude (and duration at maximum) is variable from one max to another.
    On 3 August 2012, I took 22 photos of 8-sec duration during 3.9 minutes of its pass, that confirmed the above period and showed clearly the light-variation pattern. However I didn't manage to improve the accuracy of the period (at about 51 seconds).
     
    . ENVISAT 2002-09 A
    ENVISAT's period is more tricky to derive visually as the light variation appears complex at first glance. In July I derived sometimes a 20-25 sec period during a part of each pass, but irregular flashes did appear too. Other maxima were missing.
    To have a clearer understanding of what happened:
     On 3 August 2012, I took a series of 24 photos of 8-sec duration, during 4.2 minutes of its pass.
    The photos - which turned out to be very useful - allow to derive unambiguously a 23-sec main period of long maxima (Iridium-like 'flares'), together with short flashes appearing sometimes.
    11 consecutive maxima were imaged (all of them) together with 3 short flashes occurring elsewhere on the light curve, during a rather short span of time in the pass. Some maxima look very reddish.
     
    Alain Figer
    48.67 N ; 2.13 E ; 170m a.s.l.
    
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