#format jsmath
= Space Weather =
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=== AGU Geophysical Monograph 125 2001 ===
 . p73 - Solar wind ... - C.T. Russell
  . 400 km/s, 5 electrons and ions per cm^3^,  5 nT
   . KHL:  mass density, 8e-21 kg/m^3^ ... flux, 3.3e-15 kg/m^2^-s ... > 1.3 nPa pressure ... > 500μW/m^2^ power
 . p91 - Space Weather and the Changing Sun - E.N. Parker
  . Sun core 100,000 km 100g/cm^3^ 10e7 K 
   . ten times brighter than a supernova, only 5e-12 leaks out
   . convection zone 1e-4 of power is upwards kinetic, turns into flares and solar wind
    . 0.2g/cm^3^ at base, 500,000km
    . 2e-7g/cm^2^ at surface ... temp decline 300 times, pressure decline 3e8 times
 .p143 Theory of Coronal Mass Ejections - James A. Klimchuk
  . up to 1e13kg of material, some relativistic
 .p173 Gombosi - typical 1e12kg
  . pressure from 2.25 nPa to 4.6 nPa at peak 72 hours later
  
 . IMF = Interplanetary Magnetic Field
 . Dst index = deviation of equatorial field, typically 100nT out of 31200nT during storm
  . up to 1000nT, 2200nT/minute
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=== Calculations ===
 . B = 31.2e-6T * ($R_E$/R)^3^
 . Pressure = Energy density = $ B^2/2\mu_0 $ = 3.8e-4 *($R_E$/R)^6^ Pa
  . 2.26nPa -> 7.5 $R_E$, 4.6nPa -> 6.6 $R_E$