The instruments used

I. SOHO

    A. CDS,  the cornal diagnostic spectrometer
       
            1. the CDS  studies the corona by detecting spectral  emission lines of extreme ultraviolet
               wavelengths (EUV) ranging  from 150-800 A
            2. the camera exposure is 42-87 sec
                a. we used 60 sec cadence

II. TRACE
     
    A. the  CCD (charge-couple device)


cds image     ccd  cut image   taken from Trace web site
                     
             1. the CCD also studies the corona by observing EUV wavelengths 171, 195, 284 A
                  and 1200-1700 A
         
           2. we used camera exposure  every 19 seconds




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