Harvard-Smithsonian Center for Astrophysics
Steven R. Cranmer's Home Page
I am an astrophysicist at the Harvard-Smithsonian Center for Astrophysics (CfA), working in the Solar, Stellar, and Planetary Sciences Division. I am also affiliated with the CfA's Theoretical Astrophysics Division, I'm an Associate Senior Member of the Institute for Theory and Computation (ITC), and I'm a Harvard University Lecturer on Astronomy.
In my research I study the hot, expanding outer atmospheres of the Sun and other stars. Using both theoretical models and observations, scientists are able to infer a great deal about the physical principles underlying these distant objects, adding to our knowledge of how the universe works as a whole. Understanding the Sun and its atmosphere is also a necessary precursor to being able to predict the Sun's long-term effects on the Earth's climate and local space environment.
Astron 253 (Spring 2014)
Astron 201a (Fall 2012)
Intro to solar wind
Intro to UVCS/SOHO
I'm advising Harvard graduate student Lauren Woolsey, who is doing dissertation work on models of the acceleration of the solar wind. For the past few decades, I worked with John Kohl's Ultraviolet Coronagraph Spectrometer (UVCS) group, which operated an instrument on the SOHO (Solar and Heliospheric Observatory) spacecraft from 1996 to 2013. UVCS observed ultraviolet spectral lines emitted in the extended solar corona, which have allowed us to obtain a better understanding of how the solar wind is heated and accelerated.
2013 NEWS: New X-ray results from a T Tauri star in a CfA Press Release
2011 NEWS: New stellar wind theory highlighted in a CfA Weekly Science Update
(see older news items)
- Journal Articles and Books
- Online data and codes
- Miscellaneous Documents (articles for non-specialists, unpublished notes)
- Other Presentations (seminars, colloquia, guest lectures)
- Guides to giving a good scientific talk
- Curriculum Vitae: long version and short (one-page) version, both in PDF
- 1996 Ph.D. Dissertation (individual chapters in postscript and PDF)
- Solar resources (my SPD Committee Members Resource page)
- See also (older) research pages about the solar corona and solar wind, as well as topics in hot-star winds and cool-star winds. There is also an (even older) collection of general astronomy links, but many of them may no longer be active.
In 1996 I received my Ph.D. in Physics and Astronomy from the University of Delaware, where I have worked with the Bartol Research Institute since 1992. My Ph.D. thesis advisor was Dr. Stanley P. Owocki, and my Ph.D. Dissertation is online in PDF and postscript formats. I received my B.S. in Physics from Drexel University in 1990, and my M.S. in Astronomy from the Ohio State University in 1991 (M.S. thesis advisor: Dr. George Collins). While at Drexel, I did co-op work at Princeton Plasma Physics Lab.
I am a member of the American Astronomical Society (AAS), its Historical Astronomy Division (HAD), and its Solar Physics Division (SPD). For the period 2003-2005 I served as a member of the SPD Committee, which has general charge of the affairs of the Division. I'm also a member of the American Physical Society (APS) and the American Geophysical Union (AGU), and I recently served as an Associate Editor for the AGU Journal of Geophysical Research: Space Physics.
I'm happily married since 1992 to Janet Houser. We have a 12-year-old son, Ethan, and a bunch of wonderful cats.