See also my arXiv'ed papers and the publications of the Institute for Solar Physics.
Evaluation of image-shift measurement algorithms for solar
Shack-Hartmann wavefront sensors,
Löfdahl,
Astronomy
& Astrophysics, A90, 524,
2010. [Preprint]
Striation and convection in penumbral filaments,
Spruit, Scharmer, & Löfdahl,
Astronomy
& Astrophysics, A72, 521, 2010. [Preprint]
High-order aberration compensation with Multi-frame Blind
Deconvolution and Phase Diversity image restoration
techniques,
Scharmer, Löfdahl, van Werkhoven,
& de la Cruz Rodriguez,
Astronomy
& Astrophysics, A68, 521, 2010. [Preprint]
CRISP spectropolarimetric imaging of penumbral fine
structure,
Scharmer, Narayan, Hillberg, de la Cruz Rodriguez,
Sütterlin, Löfdahl, van Noort, Kiselman &
Lagg, Astrophysical
Journal Letters, pp. L69-L72, 689(1), 2008.
Multi-frame deconvolution with space-variant point spread functions
by use of inverse filtering and FFT,
Löfdahl, Applied Optics,
46(21), pp. 4686-4693, 2007. [Preprint]
Contrast analysis of solar faculae and magnetic bright
points,
Berger, Rouppe van der Voort
& Löfdahl, Astrophysical
Journal, 661(2):1272--1288
Observations of dark-cored filaments in sunspot penumbrae,
Langhans, Scharmer, Kiselman, & Löfdahl,
Astronomy
& Astrophysics, 464, pp. 763-774, 2007.
[doi:10.1051/0004-6361:20065215]
Erratum -- A comparative study of the contrast of solar magnetic elements in CN and
CH,
Zakharov, Gandorfer, Solanki, & Löfdahl (2007),
Astronomy
& Astrophysics, 461, pp. 695.
Rapid temporal variability of faculae: High resolution observations
and modelling,
De Pontieu, Carlsson, Stein, Löfdahl, van Noort, Nordlund, Rouppe van der Voort,
& Scharmer, Astrophysical
Journal, 646, pp. 1405, 2006.
[Preprint]
[Movies]
Solar image restoration by use of multi-frame blind deconvolution
with multiple objects and phase diversity,
van Noort, Rouppe
van der Voort & Löfdahl (2005),
Solar
Physics, 228(1-2), pp. 191-215. [Abstract]
[Preprint]
[doi:10.1007/s11207-005-5782-z]
A comparative study of the contrast of solar magnetic elements in CN and
CH,
Zakharov, Gandorfer, Solanki, & Löfdahl (2005),
Astronomy
& Astrophysics, 437, pp. L43-L46.
[Preprint]
[doi:10.1051/0004-6361:200500135]
Inclination of magnetic fields and flows in sunspot
penumbrae,
Langhans, Scharmer, Kiselman, Löfdahl & Berger (2005), Astronomy
& Astrophysics, 436(3), pp. 1087-1101
[Preprint]
[doi:10.1051/0004-6361:20052678]
Solar magnetic elements at 0.1 arcsec
resolution - General appearance and magnetic structure,
Berger, Rouppe van der Voort, Löfdahl,
Carlsson, Fossum, Hansteen, Marthinussen, Title & Scharmer (2004),
Astronomy
& Astrophysics, 428, pp. 613-628 (plus
online material). [Abstract]
[Preprint]
[doi:10.1051/0004-6361:20040436]
Penumbral structure at 0.1 arcsec resolution. I. General
appearance and power spectra,
Rouppe van der Voort, Löfdahl, Kiselman, & Scharmer (2004),
Astronomy & Astrophysics, 414, pp. 717-726.
[Abstract]
[Preprint]
[doi:10.1051/0004-6361:20031611]
Dark cores in sunspot penumbral filaments,
Scharmer, Gudiksen, Kiselman, Löfdahl &
Rouppe van der Voort (2002),
Nature, 420, pp. 151-153.
[Abstract]
[Preprint]
[doi:10.1038/nature01173]
Two dual-wavelength sequences of high-resolution solar photospheric
images captured over several hours and restored by use of phase
diversity,
Löfdahl, Berger & Seldin (2001),
Astronomy & Astrophysics, 377, pp. 1128-1135.
[Abstract]
[Preprint]
[doi:10.1051/0004-6361:20011118]
An algorithm for resolving 2π ambiguities in interferometric
measurements by use of multiple wavelengths,
Löfdahl & Eriksson (2001), Optical
Engineering, 40(6), pp. 984-990.
[Abstract]
[Preprint]
[doi:10.1117/1.1365936]
Calibration of a deformable mirror and Strehl ratio measurements
by use of phase diversity,
Löfdahl, Scharmer & Wei (2000),
Applied Optics, 39(1), pp. 94.
[Abstract]
[Offprint]
Dynamics of magnetic flux elements in the solar photosphere,
van Ballegooijen, Nisenson, Noyes, Löfdahl, Stein, Nordlund
& Krishnakumar (1998),
Astrophysical Journal,
509, pp. 435.
[Abstract]
[Offprint]
[doi:10.1086/306471]
Measurements of solar magnetic element dispersal,
Berger, Löfdahl, Shine & Title (1998),
Astrophysical Journal, 506, pp. 439.
[Abstract]
[Offprint]
[doi:10.1086/306228]
Measurements of solar magnetic element motion from high resolution
filtergrams,
Berger, Löfdahl, Shine & Title (1998),
Astrophysical Journal, 495, pp. 973.
[Abstract]
[Offprint]
[Plates]
[doi:10.1086/305309]
Preparation of a dual wavelength sequence of high resolution solar
photospheric images using phase diversity,
Löfdahl, Berger, Shine & Title (1998),
Astrophysical Journal, 495, pp. 965.
[Abstract]
[Offprint]
[Plates]
[doi:10.1086/305308]
Fine structures of magnetic field in solar quiet region,
Zhang, Scharmer, Löfdahl & Yi
(1998), Solar Physics, 183, pp. 283.
[Abstract]
Evaluation of phase-diversity techniques for solar-image
restoration,
Paxman, Seldin, Löfdahl, Scharmer & Keller (1996),
Astrophysical Journal, 466, pp. 1087-1099.
[Abstract]
[Offprint]
[doi:10.1086/177578]
Wavefront sensing and image restoration from focused and defocused
solar images,
Löfdahl & Scharmer (1994),
Astronomy & Astrophysics Supplements Series, 107,
pp. 243-264.
[Abstract]
[Offprint]
Swedish solar telescope: Short summary of instrumentation and
observation techniques,
Scharmer & Löfdahl (1991),
Advances in Space Research: Opening Frontiers in
Solar Research, 11(5), pp. 129-132.
[Abstract]
[doi:10.1016/0273-1177(91)90369-U]
Wavefront sensing and wavefront reconstruction for the 4m
European Solar Telescope EST,
Berkefeld, Soltau, Del Moro,
& Löfdahl, in Proc. SPIE
7736 Adaptive Optics Systems II, pp.
77362J-77362J-9, 2010.
Adaptive optics and MCAO for the 4-m European Solar Telescope
EST,
Soltau, Berkefeld, Sánchez Capuchino, Collados Vera, Del
Moro, Löfdahl, & Scharmer, in Proc.
SPIE 7736 Adaptive Optics Systems II, pp.
77360U-77360U-11, 2010.
Recent high resolution observations and interpretations of
sunspot fine structure,
Scharmer, Langhans, Kiselman
& Löfdahl, 2007, in New Solar
Physics with Solar-B
Mission, Proc.
6th Solar-B Science Meeting, Shibata, Nagata, & Sakurai,
eds., vol. 369 of Astronomical Society of the Pacific
Conference Series, p. 71
[Preprint]
What are 'Faculae'?,
Berger, Title, Tarbell, Rouppe van
der Voort, Löfdahl, and Scharmer,
2007, in New Solar Physics with Solar-B Mission, Shibata,
Nagata, & Sakurai, eds., vol. 369 of Astronomical Society
of the Pacific Conference Series, p. 103
Solar image
restoration,
Löfdahl, van Noort
& Denker (2007), invited review, in
Proc. Modern
Solar Facilities - Advanced Solar Science, workshop in
Göttingen 27-29 September, 2006, Kneer, Puschmann & Wittmann,
eds., pp. 119-126.
[Viewgraphs]
[Preprint]
Solar image restoration by use of multi-object multi-frame blind
deconvolution,
van Noort, Rouppe van der Voort
& Löfdahl, 2006, in Solar MHD:
Theory and Observations - a High Spatial Resolution
Perspective, NSO
Workshop #23, Leibacher, Stein & Uitenbroek, eds., ASP Conf.
Ser.
354:55. [Poster
a0] [Poster
a4] [Preprint]
Phase diverse speckle inversion applied to data from the Swedish
1-meter solar telescope,
Löfdahl & Scharmer (2003),
Proc. SPIE
4853, Innovative Telescopes and Instrumentation for Solar
Astrophysics, Keil & Avakyan, eds., pp. 567-575.
[Abstract]
[Preprint]
Adaptive optics system for the new Swedish solar telescope,
Scharmer, Dettori, Löfdahl & Shand (2003),
Proc.
SPIE 4853,
Innovative Telescopes and Instrumentation for Solar
Astrophysics, Keil & Avakyan, eds., pp. 370-380.
[Abstract]
[Preprint]
Multi-frame blind deconvolution with linear equality
constraints,
Löfdahl (2002),
in Proc.
SPIE 4792, Image Reconstruction from Incomplete Data
II, Bones, Fiddy, & Millane, eds., pp. 146-155.
[Abstract]
[Preprint]
A predictor approach to closed-loop phase-diversity wavefront
sensing,
Löfdahl & Scharmer (2000),
in Proc.
SPIE 4013, UV, Optical, and IR Telescopes and
Instrumentation VI, Breckinridge & Jacobsen, eds., pp.
737-748.
[Preprint]
Resolving piston ambiguities when phasing a segmented
mirror,
Löfdahl & Eriksson (2000),
in Proc. SPIE 4013, UV, Optical, and IR
Telescopes and Instrumentation VI, Breckinridge & Jacobsen,
eds., pp. 774-782.
[Preprint]
A workstation based solar/stellar adaptive optics
system,
Scharmer,
Shand, Löfdahl, Dettori & Wei
(2000),
in Proc.
SPIE 4007, Adaptive Optical Systems Technology,
Wizinowich, ed., pp. 239-250.
[Preprint]
Fast phase diversity wavefront sensing for mirror control,
Löfdahl, Duncan, & Scharmer (1998),
in Proc. SPIE 3353, Adaptive Optical System Technologies,
Bonnaccini & Tyson, eds., pp. 952-963.
[Preprint]
A phase diversity experiment to measure piston misalignment on the
segmented primary mirror of the Keck II telescope,
Löfdahl, Kendrick, Harwit, Mitchell, Duncan,
Seldin, Paxman & Acton (1998), in Proc. SPIE 3356, Space
Telescopes and Instruments V, Bely & Breckinridge, eds., pp.
1190-1201.
[Preprint]
Application of phase-diversity to solar images,
Löfdahl & Scharmer, (1994),
in Proc. SPIE 2302, Image reconstruction and restoration,
Schultz and Snyder, eds.,
pp. 254-267. Invited paper.
SST/CRISP Magnetometry with Fe I 630.2 nm,
Narayan,
Scharmer, Hillberg, Löfdahl, van Noort,
Sutterlin, & Lagg (2008),
in Proc. 12th European
Solar Physics Meeting, Freiburg, Germany, September, 8-12,
2008, p.2.2-64, 12:120.
Spectropolarimetry of Sunspots at 0.16 arcsec
resolution,
Scharmer, Henriques, Hillberg,
Kiselman, Löfdahl, Narayan,
Sütterlin, van Noort & de La Cruz Rodriguez (2008),
in Proc. 12th European
Solar Physics Meeting, Freiburg, Germany, September, 8-12,
2008, p.2.5, 12:2.
First results from the Swedish 1-m solar telescope,
Scharmer, Kiselman, Löfdahl & Rouppe
van der Voort, ASP Conference Series 307, Proc. Third
International Workshop on Solar Polarization, Trujillo Bueno &
Sánchez Almeida, eds., Tenerife, 2003.
[Abstract]
[Preprint]
The multi aperture imaging array,
Zarifis, Bell, Benson,
Cuneo, Duncan, Herman, Holmes, Sigler, Stone, Stubbs, Kendrick,
Paxman, Seldin & Löfdahl (1999), in
ASP Conf. Series 194, Working on the Fringe: Optical and IR
Interferometry from Ground and Space, Unwin and Stachnik, eds, pp.
278.
[Draft]
[ADS]
Orthogonalization of basis functions for diagonalized wavefront
sensing,
Löfdahl (1999), in ASP Conf.
Series 183, Proc. Nineteenth Sacramento Peak Summer
Workshop, High Resolution Solar Physics: Theory, Observations, and
Techniques, Rimmele, Radick, & Balasubramaniam, Eds., pp.
320-329
[Preprint]
Phase-diversity restoration of solar images,
Löfdahl & Scharmer (1993),
in Proc. Thirteenth Sacramento Peak Summer Workshop,
Real Time and Post Facto Solar Image Correction, Radick, Ed.,
pp. 89-104.
The ROYACS user library,
Löfdahl (1992), in Proc. LEST
Mini-Workshop, Software for Solar Image Processing, Yi, Darvann
& Molowny Horas, Eds.
EST: the European Solar Telescope,
Kiselman, Löfdahl &
Scharmer, Astronomdagar,
Kiruna, Sweden,
2007. [Poster]
The Swedish 1-m Solar Telescope,
Kiselman, Löfdahl, Scharmer & van
Noort, Astronomdagar,
Kiruna, Sweden,
2007. [Poster]
Restoration of seeing-degraded solar images,
Löfdahl, Astronomdagar,
Uppsala, Sweden, 21-22 October,
2005. [Viewgraphs]
Dark-cored penumbral filaments - the building blocks of sunspot
penumbrae?,
Langhans, Scharmer, Kiselman
& Löfdahl, Astronomdagar,
Uppsala, Sweden, 21-22 October, 2005.
High resolution magnetogram measurements of solar faculae,
Berger, van der Voort, & Löfdahl,
(2005), AGU spring meeting, May,
2005. [Viewgraphs]
High-resolution observing techniques,
Scharmer
& Löfdahl (2004), 3rd ESMN School
on Solar Magnetometry and Solar Magnetism, Tatranska Lomnica,
Slovakia. 3-10 November,
2004. [Viewgraphs]
Image quality effects from wavelength dependent pupil apodisation
in narrow-band filters,
Löfdahl
& Scharmer
(2004), Solar
Image Processing Workshop II, Annapolis, Maryland, USA. 3-5
November,
2004. [Viewgraphs]
Multi-object phase diversity solar image reconstruction,
van Noort, Rouppe van der Voort
& Löfdahl
(2004), Solar
Image Processing Workshop II, Annapolis, Maryland, USA. 3-5
November, 2004.
Image reconstruction,
Denker, Tritschler
& Löfdahl
(2004), Solar
Image Processing Workshop II, Annapolis, Maryland, USA. 3-5
November, 2004.
Innovative information technology for space weather
research,
Wang, Qu, Shih, Denker,
Gerbessiotis, Löfdahl, Rees & Keller
(2004), American Astronomical Society Meeting 204, #52.09
Observations of solar magnetic elements with 0.1 arcsec
resolution,
Berger, Rouppe van der
Voort, Löfdahl, Carlsson, Fossum,
Hansteen, Marthinussen, Title & Scharmer (2004), American
Astronomical Society Meeting 204, #20.05
Intensity oscillations in the upper transition region above active
region plage,
De Pontieu, Erdelyi, de Wijn
& Löfdahl (2003), AGU Fall Meeting
2003, abstract SH42B-0540
Observations of magnetoconvection in sunspots with 100 km
resolution,
Berger, Löfdahl,
Scharmer & Title (2003), BAAS #34, 11.08
Observation and modelling of micropore formation in active network
regions,
Berger, Löfdahl &
Bercik (2002), BAAS 34, p. 953
The use of the Shack-Hartmann wavefront data for phase-diversity
analysis,
Löfdahl & Scharmer (1997),
LEST workshop: Towards a Next Generation, Large Solar
Telescope, Kiepenheuer Institut für Sonnenphysik, Freiburg, Dec. 1997
Phase-diversity restoration of two simultaneous 70-minute
photospheric sequences,
Löfdahl, Berger, Title & Shine (1997),
Bulletin of the American Astronomical Society, 29(2),
p. 896 (poster abstract).
Measurements of magnetic element dynamics in the network,
Berger, Löfdahl, Shine & Title
(1997),
Bulletin of the American Astronomical Society, 29(2),
p. 896 (poster abstract).
A phase diversity sensor to measure piston misalignment on the the
Keck II segmented mirror,
Harwit, Löfdahl, Kendrick, Seldin,
Paxman, Acton & Duncan (1997), in NGST Technology Challenge
Review, Goddard Space Flight Center, Greenbelt, MD, USA, 7-12 July
1997.
[Viewgraphs]
Phase-diversity restoration of solar
images,
Löfdahl & Scharmer
(1993),
OSA Annual Meeting Technical Digest, 16, Conference edition p. 67.
JOSO meeting 1992... (abstract)
Phase diversity wavefront sensing and image restoration applied to
high-resolution solar observations,
Löfdahl (1996),
[Part text],
PhD thesis, Stockholm University, Stockholm, Sweden.
Diffuse reflection from rough surfaces,
Löfdahl (1989), Master's thesis, Royal
Institute of Technology, Stockholm, Sweden.
Image restoration,
Denker, Tritschler & Löfdahl (2005), in
Encyclopedia
of Optical Engineering, Driggers, eds., Marcel Dekker,
Inc. [Preprint]
[doi:10.1081/E-EOE-120038539]
[doi:10.1081/E-EOE-120038539]
Fysikalen I-V,
Löfdahl, Kann & Groth, eds. (1992),
Fysikalen,
Fysiksektionen,
Tekniska Högskolans Studentkĺr.
Svarta droppen,
Kiselman
& Löfdahl (2004),
Populär astronomi, 2, p. 38
En störande atmosfär,
Löfdahl (1996),
Akademiska Gobitar, 1,
pp. 29-31
Scharmer, Löfdahl, Rouppe van der Voort (2000), Frontispiece in Solar Physics 196(1)
The SVST AO system: First results,
Scharmer, Wei, Löfdahl & Shand (1999),
www.solarphysics.kva.se/mats/AO/onoff/onoff.html