Saturday, March 4, 2017

picture, press release, data, story!


launch picture from Merrick Peirce:





The NASA press release is  here


some data, plotted by Max Roberts:

first the IMU (inertial measurement unit) showing the acceleration, magnetic field, and gyration seen by Bob27 as it is deployed out of the main payload:


The top panel shows the acceleration:  at first you see the centrifugal acceleration felt by the end of the Bob as it spins in the main payload deploy tube.  Then the main payload is spun down to zero, so the acceleration goes away.  Then you see the small kick when the doors come off, at T+121sec, and then the larger kick as the Bob is kicked out the tube.  Finally you see the centrifugal acceleration felt by the sensor as the Bob spins about its long axis.
   The second panel shows all these motions as sensed by the magnetometer.  Inside the deploy tube there are large magnetic offsets so the picture is distorted, but again you see the quiet period when the main payload is waiting to deploy the bobs.  Then once the Bob is kicked out and spun up by its rifling pins, you see the rapid spinning motion (about 1.5 Hz) of the Bob along its long axis.
   Finally the gyroscope sensor shows the rotation rate at each phase.

then here are two of the PIP ion sensors, this time on Bob30:


The two pips look in different directions; the upper panel sees large fluxes on the down leg, and the lower panel sees the entry into the arc near the beginning of the flight.


Finally, a story.  

Using the "xkcd ten hundred word" vocabulary (see here) (and here), the story of the Isinglass rocket (the "fast car") and its Bobs (the little space boats) studying the ionospheric plasma (the space air) and the north space lights....With thanks to Liz MacDonald, Max Roberts, Rob Clayton, and xkcd....     story


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