Hello Masahiro, Thank you for your message! You have made a great observation, and I think you are exactly right about the cause of the observed "glitches" in the telemetry. Usually at this point in its orbit we would observe AO-51 charging its batteries at a steady rate from fully illuminated panels.
>From what I've read from page 43 here: http://eclipse.gsfc.nasa.gov/SEpubs/2010/TP214171a.pdf the eclipse was from 18:15 to 20:52 UTC. Look also at the areas experiencing eclipse. Please be aware that the "clock" on AO-51 runs fast. It is now about 3 minutes fast, so look at telemetry timestamped from about 18:18 until 20:55 UTC. Since the duration of the solar eclipse was 2 hrs 39 min (or 159 mins) and AO-51 orbits every 100 minutes or so, it could have been affected two times. I've plotted some of the telemetry collected from that period (telemetry from 1800-2130utc) and posted it here: http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/Wd071100_1800to2130utc_solar_eclipse.xls And here's a screenshot of AO-51 at the time: http://www.amsat.org/amsat/ftp/telemetry/ao51/2010WOD/July2010/ao51_11July2010_2045utc_solar_eclipse.jpg 73! Mark N8MH 2010/7/13 Masahiro Arai <[email protected]>: > > Total solar eclipse was observed in southern Pacific Ocean at 11th > July. I checked AO-51 WOD file. Total Array I shows glitch at > 2043-2045z. AO-51 was located on east of Argentina at the time. Is > this glitch made with solar eclipse?? > > > AO-51 Wd071100 > 2010/7/11 > UTC Total Array I [mA] > 20:35 -2.111 > 20:36 -0.323 > 20:37 -0.323 > 20:38 1.465 > 20:39 -0.323 > 20:40 528.851 > 20:41 321.472 > 20:42 307.170 > 20:43 183.815 > 20:44 190.966 > 20:45 176.664 > 20:46 249.962 > 20:47 300.019 > 20:48 396.557 > 20:49 498.459 > 20:50 519.912 > 20:51 729.079 > 20:52 634.328 > 20:53 936.458 > 20:54 843.495 > 20:55 948.972 > > > WOD file > ftp://ftp.amsat.org/pub/amsat/telemetry/ao51/2010WOD/July2010/Wd071100 > > AO-51 WOD decoder > http://tinyurl.com/DK3WNsoftware > > > 73 > > Masa JN1GKZ Tokyo Japan > > > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > -- Mark L. Hammond [N8MH] _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
