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UV observations of macrospicules at the solar limb

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Abstract

During the Spacelab 2 mission, the NRL High Resolution Telescope and Spectrograph (HRTS) obtained a time-series of broad-band ultraviolet images of macrospicules at the solar limb inside a polar coronal hole with a temporal resolution of 20 and 60 s. The properties of the macrospicules observed in the Spacelab data are measured and compared with the properties reported for EUV macrospicules observed during Skylab (Bohlin et al., 1975; Withbroe et al., 1976). There is a general agreement between the data sets but several differences. Because of the higher temporal resolution of the Spacelab data, it is possible to see macrospicules with shorter lifetimes than seen during Skylab, as well as variations on faster timescales. The largest (30–60′) and fastest (150 km s -1) macrospicules seen during Skylab were not found in the Spacelab observations. The Spacelab data support the conclusion that many macrospicules decay by simply fading away.

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Authors and Affiliations

  1. E.O. Hulburt Center for Space Research, Naval Research Laboratory, 20375, Washington, D.C., USA

    K. P. Dere, J.-D. F. Bartoe, G. E. Brueckner, J. W. Cook & D. G. Socker

  2. Applied Research Corporation, 8201 Corporate Drive, 20785, Landover, MD, USA

    J. W. Ewing

Authors
  1. K. P. Dere
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  2. J.-D. F. Bartoe
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  3. G. E. Brueckner
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  4. J. W. Cook
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  5. D. G. Socker
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  6. J. W. Ewing
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Dere, K.P., Bartoe, JD.F., Brueckner, G.E. et al. UV observations of macrospicules at the solar limb. Sol Phys 119, 55–63 (1989). https://doi.org/10.1007/BF00146212

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  • DOI: https://doi.org/10.1007/BF00146212

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