Solar Physics

, Volume 260, Issue 1, pp 59–82 | Cite as

Limb Spicules from the Ground and from Space

  • Jay M. Pasachoff
  • William A. Jacobson
  • Alphonse C. Sterling
Article
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Abstract

We amassed statistics for quiet-sun chromosphere spicules at the limb using ground-based observations from the Swedish 1-m Solar Telescope on La Palma and simultaneously from NASA’s Transition Region and Coronal Explorer (TRACE) spacecraft. The observations were obtained in July 2006. With the 0.2 arcsecond resolution obtained after maximizing the ground-based resolution with the Multi-Object Multi-Frame Blind Deconvolution (MOMFBD) program, we obtained specific statistics for sizes and motions of over two dozen individual spicules, based on movies compiled at 50-second cadence for the series of five wavelengths observed in a very narrow band at Hα, on-band and at ± 0.035 nm and ± 0.070 nm (10 s at each wavelength) using the SOUP filter, and had simultaneous observations in the 160 nm EUV continuum from TRACE. The MOMFBD restoration also automatically aligned the images, facilitating the making of Dopplergrams at each off-band pair. We studied 40 Hα spicules, and 14 EUV spicules that overlapped Hα spicules; we found that their dynamical and morphological properties fit into the framework of several previous studies. From a preliminary comparison with spicule theories, our observations are consistent with a reconnection mechanism for spicule generation, and with UV spicules being a sheath region surrounding the Hα spicules.

Keywords

TRACE Swedish 1-m solar telescope Hinode Sun: spicules Sun: chromosphere Solar dynamics observatory 
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Copyright information

© US Government 2009

Authors and Affiliations

  • Jay M. Pasachoff
    • 1
    • 2
  • William A. Jacobson
    • 1
  • Alphonse C. Sterling
    • 3
  1. 1.Williams CollegeHopkins ObservatoryWilliamstownUSA
  2. 2.California Institute of TechnologyPasadenaUSA
  3. 3.NASA/MSFCHuntsvilleUSA

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