Magnetic patches in internetwork areas

A.G. de Wijn; R.J. Rutten; E.M.W.P. Haverkamp; P. Sütterlin

Magnetic patches in internetwork areas

A.G. de Wijn, R.J. Rutten, E.M.W.P. Haverkamp, P. Sütterlin

Dep Natuurkunde

extern

Research output: Chapter in Book/Report/Conference proceeding › Chapter › Academic › peer-review

Abstract

We present a study of internetwork magnetic elements that appear as bright points in G-band (photosphere) and Ca II H (low chromosphere) image sequences from the Dutch Open Telescope. Many bright points appear intermittently in groups of long-lived structures that we call “magnetic patches”. We develop an algorithm for the identification of bright points and magnetic patches. The average internetwork bright point lifetimes is measured to be 3.5 minutes in the G band, and 4.3 minutes in the Ca II H. We find an internetwork bright point number density of 0.02 Mm−2 in the G-band sequence and 0.05 Mm−2 in the Ca II H sequence. The bright points show a bimodal distribution of the frame-to-frame horizontal velocities, with a peak at 0 kms−1 and a wide hump centered around 1.2 kms−1. The patches last much longer than granular time scales (about nine hours) and outline cell-like structures on mesogranular scale. We conclude that transient internetwork bright points trace the locations of strong magnetic fields that exist before the bright point appears and remain after it disappears.

Original language	Undefined/Unknown
Title of host publication	Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005
Editors	Han Uitenbroek, John Leibacher, Robert F. Stein
Place of Publication	San Francisco
Publisher	Astronomical Society of the Pacific
Pages	20-25
Number of pages	366
ISBN (Print)	978-1-583-81222-8
Publication status	Published - 2006

Publication series

Name	Astronomical Society of the Pacific conference series
Number	354

Embargoed Document

354-0020[1]
Final published version, 641 KB
Embargo ends: 1/01/50
Request copy

Cite this

de Wijn, A. G., Rutten, R. J., Haverkamp, E. M. W. P., & Sütterlin, P. (2006). Magnetic patches in internetwork areas. In H. Uitenbroek, J. Leibacher, & R. F. Stein (Eds.), Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005 (pp. 20-25). (Astronomical Society of the Pacific conference series; No. 354). Astronomical Society of the Pacific.

de Wijn, A.G. ; Rutten, R.J. ; Haverkamp, E.M.W.P. et al. / Magnetic patches in internetwork areas. Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005. editor / Han Uitenbroek ; John Leibacher ; Robert F. Stein. San Francisco : Astronomical Society of the Pacific, 2006. pp. 20-25 (Astronomical Society of the Pacific conference series; 354).

@inbook{978f7ea798c448ccbc4bf3b09da33f6f,

title = "Magnetic patches in internetwork areas",

abstract = "We present a study of internetwork magnetic elements that appear as bright points in G-band (photosphere) and Ca II H (low chromosphere) image sequences from the Dutch Open Telescope. Many bright points appear intermittently in groups of long-lived structures that we call “magnetic patches”. We develop an algorithm for the identification of bright points and magnetic patches. The average internetwork bright point lifetimes is measured to be 3.5 minutes in the G band, and 4.3 minutes in the Ca II H. We find an internetwork bright point number density of 0.02 Mm−2 in the G-band sequence and 0.05 Mm−2 in the Ca II H sequence. The bright points show a bimodal distribution of the frame-to-frame horizontal velocities, with a peak at 0 kms−1 and a wide hump centered around 1.2 kms−1. The patches last much longer than granular time scales (about nine hours) and outline cell-like structures on mesogranular scale. We conclude that transient internetwork bright points trace the locations of strong magnetic fields that exist before the bright point appears and remain after it disappears.",

author = "{de Wijn}, A.G. and R.J. Rutten and E.M.W.P. Haverkamp and P. S{\"u}tterlin",

year = "2006",

language = "Undefined/Unknown",

isbn = "978-1-583-81222-8",

series = "Astronomical Society of the Pacific conference series",

publisher = "Astronomical Society of the Pacific",

number = "354",

pages = "20--25",

editor = "Han Uitenbroek and John Leibacher and Stein, {Robert F.}",

booktitle = "Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005",

}

de Wijn, AG, Rutten, RJ, Haverkamp, EMWP & Sütterlin, P 2006, Magnetic patches in internetwork areas. in H Uitenbroek, J Leibacher & RF Stein (eds), Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005. Astronomical Society of the Pacific conference series, no. 354, Astronomical Society of the Pacific, San Francisco, pp. 20-25.

Magnetic patches in internetwork areas. / de Wijn, A.G.; Rutten, R.J.; Haverkamp, E.M.W.P. et al.
Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005. ed. / Han Uitenbroek; John Leibacher; Robert F. Stein. San Francisco: Astronomical Society of the Pacific, 2006. p. 20-25 (Astronomical Society of the Pacific conference series; No. 354).

Research output: Chapter in Book/Report/Conference proceeding › Chapter › Academic › peer-review

TY - CHAP

T1 - Magnetic patches in internetwork areas

AU - de Wijn, A.G.

AU - Rutten, R.J.

AU - Haverkamp, E.M.W.P.

AU - Sütterlin, P.

PY - 2006

Y1 - 2006

N2 - We present a study of internetwork magnetic elements that appear as bright points in G-band (photosphere) and Ca II H (low chromosphere) image sequences from the Dutch Open Telescope. Many bright points appear intermittently in groups of long-lived structures that we call “magnetic patches”. We develop an algorithm for the identification of bright points and magnetic patches. The average internetwork bright point lifetimes is measured to be 3.5 minutes in the G band, and 4.3 minutes in the Ca II H. We find an internetwork bright point number density of 0.02 Mm−2 in the G-band sequence and 0.05 Mm−2 in the Ca II H sequence. The bright points show a bimodal distribution of the frame-to-frame horizontal velocities, with a peak at 0 kms−1 and a wide hump centered around 1.2 kms−1. The patches last much longer than granular time scales (about nine hours) and outline cell-like structures on mesogranular scale. We conclude that transient internetwork bright points trace the locations of strong magnetic fields that exist before the bright point appears and remain after it disappears.

AB - We present a study of internetwork magnetic elements that appear as bright points in G-band (photosphere) and Ca II H (low chromosphere) image sequences from the Dutch Open Telescope. Many bright points appear intermittently in groups of long-lived structures that we call “magnetic patches”. We develop an algorithm for the identification of bright points and magnetic patches. The average internetwork bright point lifetimes is measured to be 3.5 minutes in the G band, and 4.3 minutes in the Ca II H. We find an internetwork bright point number density of 0.02 Mm−2 in the G-band sequence and 0.05 Mm−2 in the Ca II H sequence. The bright points show a bimodal distribution of the frame-to-frame horizontal velocities, with a peak at 0 kms−1 and a wide hump centered around 1.2 kms−1. The patches last much longer than granular time scales (about nine hours) and outline cell-like structures on mesogranular scale. We conclude that transient internetwork bright points trace the locations of strong magnetic fields that exist before the bright point appears and remain after it disappears.

M3 - Chapter

SN - 978-1-583-81222-8

T3 - Astronomical Society of the Pacific conference series

SP - 20

EP - 25

BT - Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005

A2 - Uitenbroek, Han

A2 - Leibacher, John

A2 - Stein, Robert F.

PB - Astronomical Society of the Pacific

CY - San Francisco

ER -

de Wijn AG, Rutten RJ, Haverkamp EMWP, Sütterlin P. Magnetic patches in internetwork areas. In Uitenbroek H, Leibacher J, Stein RF, editors, Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005. San Francisco: Astronomical Society of the Pacific. 2006. p. 20-25. (Astronomical Society of the Pacific conference series; 354).