AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES

Pereira, T. M. D.; De Pontieu, B.; Carlsson, M.; Hansteen, V.; Tarbell, T. D.; Lemen, J.; Title, A.; Boerner, P.; Hurlburt, N.; Wülser, J. P.; Martínez-Sykora, J.; Kleint, L.; Golub, L.; McKillop, S.; Reeves, K. K.; Saar, S.; Testa, P.; Tian, H.; Jaeggli, S.

doi:10.1088/2041-8205/792/1/L15

Title: AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES

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Abstract

Solar spicules have eluded modelers and observers for decades. Since the discovery of the more energetic type II, spicules have become a heated topic but their contribution to the energy balance of the low solar atmosphere remains unknown. Here we give a first glimpse of what quiet-Sun spicules look like when observed with NASA's recently launched Interface Region Imaging Spectrograph (IRIS). Using IRIS spectra and filtergrams that sample the chromosphere and transition region, we compare the properties and evolution of spicules as observed in a coordinated campaign with Hinode and the Atmospheric Imaging Assembly. Our IRIS observations allow us to follow the thermal evolution of type II spicules and finally confirm that the fading of Ca II H spicules appears to be caused by rapid heating to higher temperatures. The IRIS spicules do not fade but continue evolving, reaching higher and falling back down after 500-800 s. Ca II H type II spicules are thus the initial stages of violent and hotter events that mostly remain invisible in Ca II H filtergrams. These events have very different properties from type I spicules, which show lower velocities and no fading from chromospheric passbands. The IRIS spectra of spicules show the same signature as their proposed disk counterparts,more »« less

Authors:

Pereira, T. M. D.; De Pontieu, B.; Carlsson, M.; Hansteen, V. ^[1]; Tarbell, T. D.; Lemen, J.; Title, A.; Boerner, P.; Hurlburt, N.; Wülser, J. P.; Martínez-Sykora, J.; Kleint, L. ^[2]; Golub, L.; McKillop, S.; Reeves, K. K.; Saar, S.; Testa, P.; Tian, H. ^[3]; Jaeggli, S.

Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo (Norway)
Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Org. A021S, Bldg. 252, Palo Alto, CA 94304 (United States)
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

Publication Date:: Mon Sep 01 00:00:00 EDT 2014

OSTI Identifier:: 22365163

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal Letters

Additional Journal Information:: Journal Volume: 792; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHROMOSPHERE; COMPARATIVE EVALUATIONS; EMISSION SPECTRA; INTERFACES; NASA; PLASMA; SOLAR PROMINENCES; STAR EVOLUTION; SUN; VELOCITY

Citation Formats


                    Pereira, T. M. D., De Pontieu, B., Carlsson, M., Hansteen, V., Tarbell, T. D., Lemen, J., Title, A., Boerner, P., Hurlburt, N., Wülser, J. P., Martínez-Sykora, J., Kleint, L., Golub, L., McKillop, S., Reeves, K. K., Saar, S., Testa, P., Tian, H., Jaeggli, S., and Kankelborg, C., E-mail: tiago.pereira@astro.uio.no. AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES.  United States: N. p., 2014. 
        Web.  doi:10.1088/2041-8205/792/1/L15.

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                    Pereira, T. M. D., De Pontieu, B., Carlsson, M., Hansteen, V., Tarbell, T. D., Lemen, J., Title, A., Boerner, P., Hurlburt, N., Wülser, J. P., Martínez-Sykora, J., Kleint, L., Golub, L., McKillop, S., Reeves, K. K., Saar, S., Testa, P., Tian, H., Jaeggli, S., & Kankelborg, C., E-mail: tiago.pereira@astro.uio.no. AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES.  United States.  https://doi.org/10.1088/2041-8205/792/1/L15

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                    Pereira, T. M. D., De Pontieu, B., Carlsson, M., Hansteen, V., Tarbell, T. D., Lemen, J., Title, A., Boerner, P., Hurlburt, N., Wülser, J. P., Martínez-Sykora, J., Kleint, L., Golub, L., McKillop, S., Reeves, K. K., Saar, S., Testa, P., Tian, H., Jaeggli, S., and Kankelborg, C., E-mail: tiago.pereira@astro.uio.no. 2014.  
        "AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES".  United States.  https://doi.org/10.1088/2041-8205/792/1/L15.

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@article{osti_22365163,

  title        = {AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES},

  author       = {Pereira, T. M. D. and De Pontieu, B. and Carlsson, M. and Hansteen, V. and Tarbell, T. D. and Lemen, J. and Title, A. and Boerner, P. and Hurlburt, N. and Wülser, J. P. and Martínez-Sykora, J. and Kleint, L. and Golub, L. and McKillop, S. and Reeves, K. K. and Saar, S. and Testa, P. and Tian, H. and Jaeggli, S. and Kankelborg, C., E-mail: tiago.pereira@astro.uio.no},

  abstractNote = {Solar spicules have eluded modelers and observers for decades. Since the discovery of the more energetic type II, spicules have become a heated topic but their contribution to the energy balance of the low solar atmosphere remains unknown. Here we give a first glimpse of what quiet-Sun spicules look like when observed with NASA's recently launched Interface Region Imaging Spectrograph (IRIS). Using IRIS spectra and filtergrams that sample the chromosphere and transition region, we compare the properties and evolution of spicules as observed in a coordinated campaign with Hinode and the Atmospheric Imaging Assembly. Our IRIS observations allow us to follow the thermal evolution of type II spicules and finally confirm that the fading of Ca II H spicules appears to be caused by rapid heating to higher temperatures. The IRIS spicules do not fade but continue evolving, reaching higher and falling back down after 500-800 s. Ca II H type II spicules are thus the initial stages of violent and hotter events that mostly remain invisible in Ca II H filtergrams. These events have very different properties from type I spicules, which show lower velocities and no fading from chromospheric passbands. The IRIS spectra of spicules show the same signature as their proposed disk counterparts, reinforcing earlier work. Spectroheliograms from spectral rasters also confirm that quiet-Sun spicules originate in bushes from the magnetic network. Our results suggest that type II spicules are indeed the site of vigorous heating (to at least transition region temperatures) along extensive parts of the upward moving spicular plasma.},

  doi          = {10.1088/2041-8205/792/1/L15},

  url          = {https://www.osti.gov/biblio/22365163},
  journal      = {Astrophysical Journal Letters},

  issn         = {2041-8205},

  number       = 1,

  volume       = 792,

  place        = {United States},

  year         = {Mon Sep 01 00:00:00 EDT 2014},

  month        = {Mon Sep 01 00:00:00 EDT 2014}

}

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