Dr. Cranmer's research interests include solar and stellar astrophysics. Specifically, he studies the heating and energization of particles in the solar corona, the acceleration of the solar wind, and waves and turbulence in all kinds of astrophysical plasmas. Understanding the hot, expanding outer atmosphere of the Sun is a necessary precursor to being able to predict the Sun's longterm effects on the Earth's climate and local space environment. Other research includes radiative transfer in stellar atmospheres, kinetic plasma physics, the dynamics of winds from rotating hot (O, B, WolfRayet) stars, and nonradial stellar pulsations.
keywords
solar physics, stellar astrophysics, coronal heating, solar wind acceleration, stellar winds, plasma physics, kinetic theory, MHD turbulence, radiative transfer, spectroscopy
ASTR 1200  Stars and Galaxies
Primary Instructor

Spring 2019
Nonscience majors are introduced to the nature and workings of the Sun, stars, neutron stars, black holes, interstellar gas, galaxies, quasars, plus structure and origins of the universe. Some lectures may be held at Fiske Planetarium. Offers opportunities to attend nighttime observation sessions at SommersBausch Observatory. Same as ASTR 1020 and ASTR 1040.
ASTR 2100  Fundamental Concepts in Astrophysics
Primary Instructor

Spring 2020 / Spring 2023
Covers topics in modern physics required for upperlevel astrophysics and planetary science courses, including quantum mechanics, electromagnetic spectra, atomic and nuclear physics, and thermodynamics, in the context of astrophysics, planetary and space sciences. Also introduces key topics in mathematics to support these topics.
ASTR 5120  Radiative and Dynamical Processes
Primary Instructor

Fall 2018 / Fall 2019 / Fall 2020 / Fall 2021
An introduction to radiative and dynamical processes aimed at graduate students in astrophysics, space physics and planetary science. Covers transport phenomena, the macroscopic treatment of radiation fields, magnetohydrodynamics and dynamical processes associated with planetary orbits and Nbody systems.
ASTR 5540  Mathematical Methods
Primary Instructor

Fall 2022
Presents an applied mathematics course designed to provide the necessary analytical and numerical background for courses in astrophysics, plasma physics, fluid dynamics, electromagnetism, and radiation transfer. Topics include integration techniques, linear and nonlinear differential equations, WKB and Fourier transform methods, adiabatic invariants, partial differential equations, integral equations, and integrodifferential equations. Draws illustrative examples from the areas of physics listed above. Same as ATOC 5540.
ASTR 5700  Stellar Astrophysics
Primary Instructor

Spring 2018 / Spring 2022 / Spring 2024
Explores stellar interiors, evolution and atmospheres, with the Sun and its heliosphere being used as the closest and beststudied example of a star. Covers energy generation, transport, principles of stellar structure, stellar rotation, pulsation and evolution to supernova and compact object stages. Includes radiation transport in stellar photospheres, chromospheres, coronas, winds. Department enforced prerequisite: senior level undergraduate physics. Recommended prerequisite: ASTR 5120.
ASTR 6000  Seminar in Astrophysics
Primary Instructor

Spring 2022
Studies current research and research literature on an astrophysical topic. Students and faculty give presentations. Subjects vary each semester. May be repeated for a total of 4 credit hours to meet candidacy requirements.
ATOC 5540  Mathematical Methods
Primary Instructor

Fall 2022
Applied mathematics course; provides necessary analytical background for courses in plasma physics,fluid dynamics, electromagnetism, and radiative transfer. Covers integration techniques, linear and nonlinear differential equations, WKB and Fourier transform methods, adiabatic invariants, partial differential equations, integral equations, and integrodifferential equations. Same as ASTR 5540.
FYSM 1000  First Year Seminar
Primary Instructor

Fall 2019
Provide first year students with an immersive experience in an interdisciplinary topic that addresses current issues including social, technical and global topics. Taught by faculty from across campus, the course provides students with an opportunity to interact in small classes, have project based learning experiences and gain valuable communication skills. Seminar style classes focused on discussion and projects.