The Solar Wind.pdf

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• The most detailed observations of the solar windhave been made from spacecraft near the Earth.Observed Properties of the Solar Wind near the Orbit ofthe Earth (after Hundhausen, [1995])Proton density 6.6 cm -3Electron density 7.1 cm -3He 2+ density 0.25 cm -3Flow speed (nearly radial) 450 km s -1Proton temperatureElectron temperatureMagnetic field1.2x10 5 K1.4x10 5 K7x10 -9 T
• It is useful to describe the solar wind in terms ofquantities that are conserved in the plasma flow.Flux Through a Sphere at 1AU(after Hundhausen, [1995])Protons 8.4x10 35 s -1Mass 1.6x10 12 g s -1Radial momentum7.3x10 14 N (Newton)Kinetic energy 1.7x10 27 erg s -1Thermal energy 0.05x10 27 erg s -1Magnetic energy 0.025x10 27 erg s -1Radial magnetic flux1.4x10 15 Wb (Weber)
Page 1 and 2: ESS 200CLectures 6 and 7The Solar W
Page 3: • Solar wind speeds (heavy lines)
Page 8 and 9: • The transition from subsonic to
Page 10 and 11: • For the solar wind to continue
Page 12 and 13: • Waves and turbulence?- One poss
Page 15: • In summary the outer layer of t
Page 19: ω > Sunv ϕϕSun r r- At large dis
Page 22: • A meridian view of the IMF- The
Page 26 and 27: • Observations of high speed stre
Page 28: • Time series of parameters assoc
Page 31 and 32: • Plasma measurementsshow a drama
Page 33 and 34: • A coronal mass ejection in spac
Page 35 and 36: • The magnetic field configuratio
Page 37 and 38: •The solar wind forms abubble, ca
Page 39: • The Voyager passage through the

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