The Sileye experiments: 1995-2002
As in the case of ground tests, Light Flash research in space was resumed after 20 years on board Mir Space Station with the Sileye experiments,
which placed two detectors (Sileye-1 in 1995 and Sileye-2 in 1998) and involved 6 astronauts in LF observations on MIR between 1995 and 1999.
A third detector, Sileye-3/Alteino was used on the International Space Station (ISS) in 2002 during the Soyuz-34 mission.
Overall these experiments have resulted in 35 observation sessions by 7 astronauts.
All detectors share the same philosophy of the previous devices. They consist in an helmet which contains a cosmic ray silicon tracking detector:
the astronaut wears the helmet (with a light shielding mask), undergoes a period of dark adaptation and pushes a button when he observes a LF.
In parallel the silicon detector measures cosmic rays above 40MeV/n from protons to Iron.
Results of the observations are resumed in Table 1
and compared with previous observations:
it is possbile to see how LF perception on board Mir is lower than that observed on previous experiments (0.13 LF/min).
This is probably due to a lower orbit and and higher shielding of the station.