The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope

R.H. Hammerschlag; V.I. Skomorovsky; I. Valery; F.C.M. Bettonvil; G. Sliepen; F. Snik

The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope

R.H. Hammerschlag, V.I. Skomorovsky, I. Valery, F.C.M. Bettonvil, G. Sliepen, F. Snik

Dep Natuurkunde

extern

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

Abstract

A wide-field birefringent filter for the barium II line at 455.4nm is developed in Irkutsk. The Barium line is excellent for Doppler-shift measurements because of low thermal line-broadening and steep flanks of the line profile. The filter width is 0.008nm and the filter is tunable over 0.4nm through the whole line and far enough in the neighboring regions. A fast tuning system with servomotor is developed at the Dutch Open Telescope (DOT). Observations are done in speckle mode with 10 images per second and Keller-VonDerLühe reconstruction using synchronous images of a nearby bluecontinuum channel at 450.5nm. Simultaneous observation of several line positions, typically 3 or 5, are made with this combination of fast tuning and speckle. All polarizers are birefringent prisms which largely reduced the light loss compared to polarizing sheets. The advantage of this filter over Fabry-Perot filters is its wide field due to a large permitted entrance angle and no need of polishing extremely precise surfaces. The BaII observations at the DOT occur simultaneously with those of a fast-tunable birefringent H-alpha filter. This gives the unique possibility of simultaneous speckle-reconstructed observations of velocities in photosphere (BaII) and chromosphere (H-alpha).

Original language	English
Title of host publication	Ground-based and airborne instrumentation for astronomy III
Editors	Ian S. McLean, Suzanne K. Ramsay, Hideki Takami
Place of Publication	Bellingham, Washington
Publisher	SPIE
Pages	773585-773585-11
Number of pages	773575
ISBN (Print)	9780819482259
Publication status	Published - 2010

Publication series

Name	Proceedings of SPIE
Number	7735

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Hammerschlag, R. H., Skomorovsky, V. I., Valery, I., Bettonvil, F. C. M., Sliepen, G., & Snik, F. (2010). The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope. In I. S. McLean, S. K. Ramsay, & H. Takami (Eds.), Ground-based and airborne instrumentation for astronomy III (pp. 773585-773585-11). (Proceedings of SPIE; No. 7735). SPIE.

Hammerschlag, R.H. ; Skomorovsky, V.I. ; Valery, I. et al. / The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope. Ground-based and airborne instrumentation for astronomy III. editor / Ian S. McLean ; Suzanne K. Ramsay ; Hideki Takami. Bellingham, Washington : SPIE, 2010. pp. 773585-773585-11 (Proceedings of SPIE; 7735).

@inbook{58c0e28ee4d44c9389bd5c1fe4a06a9f,

title = "The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope",

abstract = "A wide-field birefringent filter for the barium II line at 455.4nm is developed in Irkutsk. The Barium line is excellent for Doppler-shift measurements because of low thermal line-broadening and steep flanks of the line profile. The filter width is 0.008nm and the filter is tunable over 0.4nm through the whole line and far enough in the neighboring regions. A fast tuning system with servomotor is developed at the Dutch Open Telescope (DOT). Observations are done in speckle mode with 10 images per second and Keller-VonDerL{\"u}he reconstruction using synchronous images of a nearby bluecontinuum channel at 450.5nm. Simultaneous observation of several line positions, typically 3 or 5, are made with this combination of fast tuning and speckle. All polarizers are birefringent prisms which largely reduced the light loss compared to polarizing sheets. The advantage of this filter over Fabry-Perot filters is its wide field due to a large permitted entrance angle and no need of polishing extremely precise surfaces. The BaII observations at the DOT occur simultaneously with those of a fast-tunable birefringent H-alpha filter. This gives the unique possibility of simultaneous speckle-reconstructed observations of velocities in photosphere (BaII) and chromosphere (H-alpha).",

author = "R.H. Hammerschlag and V.I. Skomorovsky and I. Valery and F.C.M. Bettonvil and G. Sliepen and F. Snik",

note = "Samen met ca. 25 andere auteurs",

year = "2010",

language = "English",

isbn = "9780819482259",

series = "Proceedings of SPIE",

publisher = "SPIE",

number = "7735",

pages = "773585--773585--11",

editor = "McLean, {Ian S.} and Ramsay, {Suzanne K.} and Hideki Takami",

booktitle = "Ground-based and airborne instrumentation for astronomy III",

address = "United States",

}

Hammerschlag, RH, Skomorovsky, VI, Valery, I, Bettonvil, FCM, Sliepen, G & Snik, F 2010, The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope. in IS McLean, SK Ramsay & H Takami (eds), Ground-based and airborne instrumentation for astronomy III. Proceedings of SPIE, no. 7735, SPIE, Bellingham, Washington, pp. 773585-773585-11.

The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope. / Hammerschlag, R.H.; Skomorovsky, V.I.; Valery, I. et al.
Ground-based and airborne instrumentation for astronomy III. ed. / Ian S. McLean; Suzanne K. Ramsay; Hideki Takami. Bellingham, Washington: SPIE, 2010. p. 773585-773585-11 (Proceedings of SPIE; No. 7735).

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

TY - CHAP

T1 - The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope

AU - Hammerschlag, R.H.

AU - Skomorovsky, V.I.

AU - Valery, I.

AU - Bettonvil, F.C.M.

AU - Sliepen, G.

AU - Snik, F.

N1 - Samen met ca. 25 andere auteurs

PY - 2010

Y1 - 2010

N2 - A wide-field birefringent filter for the barium II line at 455.4nm is developed in Irkutsk. The Barium line is excellent for Doppler-shift measurements because of low thermal line-broadening and steep flanks of the line profile. The filter width is 0.008nm and the filter is tunable over 0.4nm through the whole line and far enough in the neighboring regions. A fast tuning system with servomotor is developed at the Dutch Open Telescope (DOT). Observations are done in speckle mode with 10 images per second and Keller-VonDerLühe reconstruction using synchronous images of a nearby bluecontinuum channel at 450.5nm. Simultaneous observation of several line positions, typically 3 or 5, are made with this combination of fast tuning and speckle. All polarizers are birefringent prisms which largely reduced the light loss compared to polarizing sheets. The advantage of this filter over Fabry-Perot filters is its wide field due to a large permitted entrance angle and no need of polishing extremely precise surfaces. The BaII observations at the DOT occur simultaneously with those of a fast-tunable birefringent H-alpha filter. This gives the unique possibility of simultaneous speckle-reconstructed observations of velocities in photosphere (BaII) and chromosphere (H-alpha).

AB - A wide-field birefringent filter for the barium II line at 455.4nm is developed in Irkutsk. The Barium line is excellent for Doppler-shift measurements because of low thermal line-broadening and steep flanks of the line profile. The filter width is 0.008nm and the filter is tunable over 0.4nm through the whole line and far enough in the neighboring regions. A fast tuning system with servomotor is developed at the Dutch Open Telescope (DOT). Observations are done in speckle mode with 10 images per second and Keller-VonDerLühe reconstruction using synchronous images of a nearby bluecontinuum channel at 450.5nm. Simultaneous observation of several line positions, typically 3 or 5, are made with this combination of fast tuning and speckle. All polarizers are birefringent prisms which largely reduced the light loss compared to polarizing sheets. The advantage of this filter over Fabry-Perot filters is its wide field due to a large permitted entrance angle and no need of polishing extremely precise surfaces. The BaII observations at the DOT occur simultaneously with those of a fast-tunable birefringent H-alpha filter. This gives the unique possibility of simultaneous speckle-reconstructed observations of velocities in photosphere (BaII) and chromosphere (H-alpha).

M3 - Chapter

SN - 9780819482259

T3 - Proceedings of SPIE

SP - 773585-773585-11

BT - Ground-based and airborne instrumentation for astronomy III

A2 - McLean, Ian S.

A2 - Ramsay, Suzanne K.

A2 - Takami, Hideki

PB - SPIE

CY - Bellingham, Washington

ER -

Hammerschlag RH, Skomorovsky VI, Valery I, Bettonvil FCM, Sliepen G, Snik F. The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope. In McLean IS, Ramsay SK, Takami H, editors, Ground-based and airborne instrumentation for astronomy III. Bellingham, Washington: SPIE. 2010. p. 773585-773585-11. (Proceedings of SPIE; 7735).

The Irkutsk Barium filter for narrow-band wide-field high-resolution solar images at the Dutch Open Telescope

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