8.6 Behaviour around a 8.7 Glitches Glitches are caused by such events as fast moving electrons and ions inside the earth's magnetic field hitting the detectors.
Most glitches cause an increase in the output voltage, but some can cause a decrease.
Figure 8.5 shows an example of a glitch in the 24Hz ERD data . Note that the sets of two points with Bit values of around 2700-2800 are the result of the detector reset every second. The sample immediately after the two high points is also affected but appears okay due to the signal level. These tails are especially seen in band 4, due to the detector material and operating conditions, and are probably due to memory effects , see section 8.8 . Figure 8.6 shows two examples of band 4 glitches in the SPD .