GR translation: in short bursts or jangles/the light jangling this way

[Mike Jing]

V137.5-15, P139.19-30   In recent days, at certain hours, a round
white light, quite intense, has gone sliding along and down in a
straight line through the air. Here, suddenly, it appears again, its
course linear as always, right to left. But this time it isn’t
constant—instead it lights up brilliantly in short bursts or jangles.
The apparition, this time, is taken by those present as a
warning—something wrong, drastically wrong, with the day . . . . No
one knew what the round light signified. A commission had been
appointed, an investigation under way, the answer tantalizingly close—
but now the light’s behavior has changed . . . . The assembly
adjourns. On seeing the light jangling this way, you begin to wait for
something terrible—not exactly an air raid but something close to
that.

What does "jangle" mean here?
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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l