TY  -  
T1  - Characterization of non-imaging semiconductor X-ray solar monitors 
SN  -  /  
UR  - URN:ISBN:978-952-10-5986-5; http://hdl.handle.net/10138/23307 
T3  -  
A1  - Alha, Lauri 
A2  -  
PB  - Helsingin yliopisto 
Y1  - 2010 
LA  - en 
AB  - The first observations of solar X-rays date back to late 1940 s. In order to observe solar X-rays the instruments have to be lifted above the Earth s atmosphere, since all high energy radiation from the space is almost totally attenuated by it. This is a good thing for all living creatures, but bad for X-ray astronomers. Detectors observing X-ray emission from space must be placed on-board satellites, which makes this particular discipline of astronomy technologically and operationally demanding... 
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KW  - tähtitiede 
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