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Hα coronagraph observations of a flare spray, March 1, 1969

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Abstract

An Hα solar prominence with the characteristics of a spray was ejected in association with a bright limb flare. Knots of material were observed to a distance of more than one solar radius above the west limb of the Sun. The optical event was followed by 80 MHz emission from a type IV source which was observed moving out through several solar radii.

Coronagraph observations have been used to determine the trajectories and velocities of the knots in directions perpendicular to the line of sight. After some early deceleration velocities increase to 300–500 km/sec and slowly decline with variations depending on the initial direction of outflow. We suggest that the magnetic field over the spot group is deformed by the energy of the mass motions of material fragments, some of which then continue to move outward from the Sun.

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References

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  3. Smith, E. v. p.: 1968, Nobel Symp. 9, Wiley, p. 137.

  4. Solar-Geophysical Data, 1969, Nos. 297, 300–302, ESSA Research Laboratories.

  5. Warwick, J. W.: 1957, Astrophys. J. 125, 811.

  6. Wild, J. P.: 1967, Proc. IREE Austral. 28, No. 9.

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McCabe, M.K., Fisher, R.R. Hα coronagraph observations of a flare spray, March 1, 1969. Sol Phys 14, 212–220 (1970). https://doi.org/10.1007/BF00240181

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Keywords

  • Magnetic Field
  • Flare
  • Mass Motion
  • Optical Event
  • Solar Radius