MUON RESEARCH by fjzhangxiaoquan

VIEWS: 8 PAGES: 7

									U of R Muon




              GOES 12 X ray
  Jan. 20, 2005 Solar Flare Cosmic
     Ray GLE/Forbush Decrease
• The January 20th, 2005 solar flare produced a
  dramatic increase in the University of Rochester
  Cosmic Ray Muon Detector rate within minutes of the
  flare and roughly coinciding with the detection of the
  X ray pulse by the NOAA GOES-12 satellite
• This was detected by neutron monitors in Moscow and
  Thule
• This event is an example of a cosmic ray ground level
  enhancement, or GLE
• GLEs begin a few minutes after flare maximum and
  last for a few tens of minutes to hours
                 Average muon rate vs Kp index- Chandni Sud
                       Average Muon Rate vs Kp index

           380
           378                               y = -1.1694x + 379.12
           376                                     R2 = 0.9048
Kp Index




           374
           372
           370
           368
           366
                 0        2         4           6            8       10
                                Average Muon Rate (Hz)
 Average Muon Rate vs Kp Index
• An anti-correlation exists between the muon
  rate and Kp index
• The Kp Index measures disturbances in the
  earth’s magnetic field from ground level
• When charged particles, such as the muon,
  move through a magnetic field, they lose more
  energy and are more likely to decay before
  reaching the ground
• The detector picks up less muons because
  they have decayed into smaller particles
                   Pressure-Corrected Muon Rate and
           Pressure-Corrected Muon Rate and Kp
                           Kp Index vs.
                       Index vs Time Time
           390                                        10
                      Muon Rate
                                                      9




                                                           U of R Muon rate (Hz)
           385
                                                      8
           380                                        7
Kp Index




           375                                        6
                                                                                   Mu
                                                      5
           370                                                                     Kp
                                                      4
           365                                        3
                                                      2
           360
                                                 .
                                           Kp Index
                                                      1
           355                                        0
                 0            5000         10000
                              Time (min)

								
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