The EMW from remote lightning (somewhere in Burkina Faso) coming to beam tubes of the LIGO interferometers through ionospheric channel, provides burst action to tubes. This forces some several molecules of noble gas to leave walls of the tubes, get ionized and simultaneously start motion along the lines of magnetic field to ion pump. (Here http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6961778&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6961778 they say, ion pumps are kept on during LIGO runs.) In order to provide action of ion pumps, the LIGO tubes are not grounded.
The charged particles in magnetic field will follow their gyrofrequency and accelerate, when getting closer to ion pump magnet. Consequently, the waveform may look as inspiral of CBC.
This concept of measurement appears like a conglomeration of shortcuts::
"To maintain [or to achieve: we don't know] UHV, ~10-7 pa in the beam tube, silent pump, viz. ion pump will be kept on. The ion pumps will be installed at the ports at both the ends of the tube. This study described the pressure variation from one end to the other end of a 2 km long tube for different locations of the ion pumps. This type of study may help to locate pumping ports and decide the required number of pumps to maintain UHV condition in very long tube for years."
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