NASA ADS Publication List



2015



Watson, F., Beck, C., Penn, M.J., Tritschler, A., Martinez-Pillet, V., Livingston, W. ``Cross-calibrating sunspot magnetic field strength measurements from the McMath-Pierce Solar Telescope and the Dunn Solar Telescope '' Solar Physics, submitted

Schad, T., Penn, M.J., Lin, H., Tritschler ``He I vector magnetic field maps of a sunspot and its superpenumbral fine-structure'' Solar Physics, accepted

2014



Penn, M.J. ``Infrared Solar Physics'' Living Reviews in Solar Physics, v11, p2.

Watson, F.T., Penn, M.J., Livingston, W. ``A Multi-Instrument Analysis of Sunspot Umbrae '' ApJ, 787, p22

2013



Schad, T.A., Penn, M.J., Lin, H. ``He I Vector Magnetometry of Field-aligned Superpenumbral Fibrils '' ApJ, 768, p111

2012



Livingston, W., Penn, M.J., Svalgaard, L. ``Decreasing Sunspot Magnetic Fields Explain Unique 10.7cm Radio Flux '' ApJ Letters, 757, 8.

Ren, D., Zhang, X., Penn, M., Wang, H., Dou, J., Zhu, Y., Rong, L., Wang, X. ``Recent progress on the portable solar adaptive optics '' SPIE, 8447, 84473K-1

2011



Penn, M.J. & Livingston, W. ``Long-term evolution of sunspot magnetic fields'' IAU Symposium 273, p126

Penn, M.J., Schad, T., Cox, E. ``Probing the Solar Atmosphere Using Oscillations of Infrared CO Spectral Lines'' ApJ, 734, p47

Schad, T.A., Jaeggli, S.A., Lin, H., Penn, M.J. ``Spectropolarimetry of Chromospheric Magnetic and Velocity Structures AboveActive Regions '' ASP Conference Series, v437, 483

2010



Ren, D., Penn, M., Plymate, C., Wang, H., Zhang, X., Dong, B., Brown, N. Denio, A. ``A portable solar adaptive optics system: software and laboratory developments '' SPIE, 7763, 77363P-1

Schad, T.A. & Penn, M.J. ``IR spectroscopy of COmosphere dynamics with the CO first overtone band'' Astron. Nachr., v331, n6, p589

Schad, T.A. & Penn, M.J. ``Structural Invariance of Sunspot Umbrae over the Solar Cycle: 1993-2004'' Solar Physics, v262, p19

Jaeggli, S.A., Lin, H., Mickey, D.L., Kuhn, J.R., Hegwer, S.L, Rimmele, T.R. & Penn, M.J. ``FIRS: a new instrument for photospheric and chromospheric studies at the DST'' Mem. S.A.It. Vol. 81, 763

2009



Ren, D., Penn, M., Wang, H., Chapman, G., Plymate, C. ``A Portable Solar Adaptive Optics System?'' SPIE, 7438, 74380P-1

Livingston, W. and Penn, M. ``Are Sunspots Different During This Solar Minimum?'' EOST, v90, p257

2007



Penn, M.J. and MacDonald, R.K.D. ``Solar Cycle Changes in Sunspot Umbral Intensity'' ApJ 662, L123

2006



Penn, M.J., Jaeggli, S.A., Henney, C.J., Luszcz, S., Walton, S.R. `` Penumbral MMFs'' ASPC, 358, p31. eds. Casini and Lites

Penn, M.J. and Livingston, W. ``Temporal Changes in Sunspot Umbral Magnetic Fields and Temperatures'' ApJ 649, L45

2005



`` Large-scale Structures and Their Role in Solar Activity'' ASPC, 346, eds. Sankarasubramanian, Penn, Pevtsov

Socas-Navoarro, H. et al., ``Solar Site Survey for the Advanced Technology Solar Telescope. I. Analysis of the Seeing Data'' PASP, 117, 1296

2004



Hill, F. et al. ``Solar site testing for the Advanced Technology Solar Telescope'' SPIE, 5489, 122

Penn, M.J., Lin, H., Tomczyk, S., Elmore, D., Judge, P. ``Background Induced Measurement Errors in the Coronal Intensity, Density, Velocity and Magnetic Field'' Solar Physics, 2004, 222, p61.

Lin, H., Penn, M.J. ``ATST Site Survey Sky Brightness Monitor'' PASP, 2004, 116, p652.

Penn, M.J., Lin, H., Schmidt, A.M., Gerke, J., Hill, F. ``Extinction and Sky Brightness at Two Solar Observatories'' Solar Physics, 2004, 220, p107.

2003



Penn, M.J., Cao, W.D., Walton, S.R., Chapman, G.A., Livingston, W., ``Imaging Spectropolarimetry of Ti I 2231nm in a Sunspot '' Solar Physics, 2003, 215, p87.

Penn, M.J., Cao, W.D., Walton, S.R., Chapman, G.A., Livingston, W., ``Weak Infrared Molecular Lines Reveal Rapid Outflow in Cool Magnetic Sunspot Penumbral Fibrils '' ApJ Letters, 2003, 590, L119.

Penn, M.J. Walton, S.R., Chapman, G.A., Ceja, J.A., Plick, W., ``Temperature Dependence of Molecular Line Strengths and Fe I 1565 nm Zeeman Splitting in a Sunspot '' Solar Physics, 2003, 213 p55

2002



Penn, M.J. and Jones, H.P., ``Stokes V profiles in a post-flare Ca II 854.2nm Downflow'', ASP Conference Series ``Current Theorectical Models and Future High Resolution Solar Observing: Preparing for ATST'' eds. A. Pevtsov and H. Uitenbroek, 2002, v286 p355. Postscript version

Judge, P.G., Tomczyk, S., Livingston, W.C., Keller, C.U. and Penn, M.J., ``Spectroscopic detection of the 3.934 micron line of Si IX in the solar corona'', ApJ. Letters, 576, L157

Penn, M.J., Ceja, J.A., Bell, E., Frye, G., and Linck, R., ``Infrared Spectroscopy from San Fernando Observatory: He I 1083nm, O I 1316nm, and Fe I 1565nm'', Solar Physics, 2002, 205 p53

2000



Penn, M.J., ``An Erupting Active Region Filament: Three-Dimensional Trajectory and Hydrogen Column Density'', Solar Physics, 2000, 197 p313

Lin, H., Penn, M.J. and Tomczyk, S., ``A New Precise Measurement of the Coronal Magnetic Field Strength'', ApJ Letters, 2000, 541, pL83

1999



Harvey, K.L., Jones, H.P., Schrijver, C.J. and Penn, M.J., ``Does Magnetic Flux Submerge at Flux Cancellation Sites?'', Sol. Physics, 1999, 190, p35

Penn, M.J., ``New Measurements of the Solar Limb Emission in the O I 777.4 nm and 844.6 nm Lines'', Ap. J. Lett., 1999, 518, L131-134.

Wood, C.H., Habbal, S.R., Esser, R., and Penn, M.J., ``Comparison of Fe \lambda 5303, \lambda 6374 and \lambda 7892 Spectral Line Observations in a Coronal Hole and Streamer Below 1.5Rsun'', AIP Conference Proceedings, 1999, 471, p293.

1998



Lin, H., Penn, M.J., Kuhn, J.R., ``He I 10830 A Line Polarimetry: A New Tool to Probe the Filament Magnetic Fields'', Ap. J., 1998, 493, 978.
Erratum

Penn, M.J., Altrock, R.C., Henry, T., Guhathakurta, M., ``Synoptic Coronal Temperature, Magnetic Field and He I 1083 nm Observations'', Synoptic Solar Physics, Proceedings of the 18th NSO/Sac Peak Workshop, ASP Conference Series, K.S. Balasubramanian, J.W. Harvey and D.M. Rabin, eds., 1998, 140, 325.

Andretta, V., Jordan, S., Muglach, K., Garcia, A., Jones, H., Penn, M., Soltau, D., ``The Helium Spectrum in the Quiet Sun: The January 16/17 and May 7-13 1997 Coordinated SoHO/Ground-based Observational Campaigns'', ASP Conference Series, 1998, 155, p336.

1997



Penn, M.J., Allen, C.L., ``He I 1083 nm Oscillations and Downflows near the North Solar Pole'', Sol. Phys., 1997, 174 359.

Penn, M.J., ``Quiet Sun He I 1083 nm Chromospheric Flows'', Proceedings of the Fifth SOHO Workshop, The Corona and Solar Wind near Minimum Activity, ESA SP-404, 1997, 583.

Andretta, V., Jordan, S.D., Jones, H.P., and Penn, M.J., ``Investigating the Formation of the Helium Spectrum with Coordinated SoHO/Kitt Peak/Sacramento Peak Observations'', Proceedings of the Fifth SOHO Workshop, The Corona and Solar Wind near Minimum Activity, ESA SP-404, 1997, 163.

1996



Dupree, A., Penn, M.J., Jones, H.P., ``He I 10830 A Wing Asymmetry in Polar Coronal Holes: Evidence for Radial Outflows'', Ap. J. Lett., 1996, 467, L121.

Kuhn, J.R., Penn, M.J, Mann, I., ``The Near-Infrared Coronal Spectrum'', Ap. J. Lett., 1996, 456, L67.

Penn, M.J., Jones, H.P., ``Limb Observations of He I 1083 nm'', Sol. Phys., 1996, 168, 19.

Mann, I., Kuhn, J.R. and Penn, M.J., ``Spectroscopic Observations of Neutral Helium During the 1994 Eclipse'', ASP Conference Series, 1996, 104, p345.

1995



Penn, M.J., Kuhn, J.R., ``Imaging Spectro-Polarimetry of the He I 1083nm Line in a Flaring Solar Active Region'', Ap. J. Lett., 1995, 441, L51.

Infrared Tools for Solar Astrophysics: What's Next? Proceedings of the Fifteenth NSO/SP Workshop, World Scientific Publishing, Singapore, 1995 eds. Kuhn & Penn

Penn, M.J., ``New Observations of IR Coronal Emission Lines'', Infrared Tools for Solar Astrophysics: What's Next?, Proceedings of the Fifteenth NSO/SP Workshop, J. Kuhn and M. Penn eds, World Scientific Publishing, Singapore, 1995, 69.

Penn, M.J., Kuhn, J.R., ``Polarimetric IR Array Observations of a Flare'', Infrared Tools for Solar Astrophysics: What's Next?, Proceedings of the Fifteenth NSO/SP Workshop, J. Kuhn and M. Penn eds, World Scientific Publishing, Singapore, 1995, 393.

1994



Penn, M.J., Kuhn, J.R., ``How Bright is the [Si X] 1430 nm Coronal Emission Line?'', Solar Phys., 1994, 151, 51-56.

Penn, M.J., Arnaud, J., Mickey, D.L., LaBonte, B.J., Kuhn, J.R., ``Coronal Electron Density Measurements Using the Near-IR [Fe XIII] Emission Lines'', Space Sci. Rev., 1994, 70, 185.

Penn, M.J., Arnaud, J., Mickey, D.L., LaBonte, B.J., ``Near Infrared Emission Line and Continuum Observations from the 1991 Eclipse'', Ap. J., 1994, 436, 368.

Penn, M.J., Kuhn, J.R., ``Ground-based Detection of an IR [Si X] Coronal Emission Line and Improved Wavelengths for the IR [Fe XIII] Emission Lines.'', Ap. J., 1994, 434, 807.

Kuhn, J.R., Balasubramaniam, K., Kopp, G., Penn, M., Dombard, A., Lin, H., ``Removing Instrumental Polarization from Infrared Solar Polarimetric Observations.'', Solar Phys., 1994, 153, 143.

1993



Penn, M.J., LaBonte, B.J., ``The Source of Five-Minute Period Photospheric Umbral Oscillations'', Ap. J., 1993, 415, 383.

Penn, M.J., ``The Source of Five-Minute Period Photospheric Umbral Oscillations'', PASP,1993, 105, No. 686, 443.

1991



Penn, M.J., Mickey, D.L. Canfield, R.C., LaBonte, B.J., ``The Mees CCD Imaging Spectrograph'', Solar Phys., 1991, 135, 163.

1990



Canfield, R.C., Kiplinger, A.L., Penn, M.J., Wulser, J.P., ``H \alpha Redshifts and Blueshifts in Five Well-Observed H \alpha X-Ray Flares'', Ap. J., 1990, 363, 318.

1986



Libbrecht, K.G., Popp, B.D., Kaufman, J.M., Penn, M.J., ``The excitation and damping of solar oscillations'', Nature, 1986, 323, 235.