98 / FIELDS OF INSTRUCTION

ATY 634-RADIOPROPAGATION AND IONOSPHERIC PHYSICS 2. 3 credits
 Identical with PS 634. Prerequisite: ATY 633. Ionospheric electron density
and ion composition profiles; diurnal, seasonal, and global variations; pre-sunrise
effects; electron and ion temperatures; traveling disturbances; solar flare and mag-
netic storm effects.
ATY 636-ATOMIC PHYSICS OF PLANETARY ATMOSPHERES. 3 credits
 Identical with PS 636. Prerequisites: Basic physics courses and mathematics
courses through integral calculus. Atomic and quantum theory, quantum mechanics
and the central field problem, atomic and molecular spectroscopy, collisional cross
sections for aeronomy.
ATY 637-PHYSICS OF THE EARTH'S UPPER ATMOSPHERE. 3 credits
 Identical with PS 637. Prerequisite: ATY 636. Solar-terrestrial relations, aurora,
airglow, and ionospheric phenomena. Remote sensing of atmospheric emissions and
scattered solar radiation.
ATY 638-PHYSICS OF PLANETARY ATMOSPHERES. 3 credits
 Identical with PS 638. Prerequisite: ATY 637. Radiative transfer in planetary
atmospheres, from the x-ray to radio regions. Discussion of recent studies of the
atmospheres of Venus, Mars, Jupiter, and other planets.
ATY 643-VISUAL AND SPECTROSCOPIC BINARY STARS 1. 3 credits
 Prerequisites: ATY 605, ATY 622. Theoretical studies and analyses of obser-
vations of both visual and spectroscopic binaries.
ATY 644-VISUAL AND SPECTROSCOPIC BINARY STARS 2. 3 credits
 Prerequisite: ATY 643. Continuation of ATY 643.
ATY 645-ECLIPSING BINARY STARS 1. 3 credits
 Prerequisites: ATY 605, ATY 622. Theoretical studies and analyses of observa-
tions of eclipsing variables.
ATY 646-ECLIPSING BINARY STARS 2. 3 credits
 Prerequisite: ATY 645. Continuation of ATY 645.
ATY 651-VARIABLE STARS. 3 credits
 Prerequisite: ATY 317. An overall picture of the different types of variable
stars. Classification, light and spectral changes, population distribution, physical
processes causing variability, the place of variables in stellar evolution. Use of
variable stars in galactic and extragalactic studies.
ATY 680-SEMINAR IN MODERN ASTRONOMY. 1 credit
 Recent developments in theoretical and observational astronomy and astro-
physics. May be repeated with change of content up to a maximum of 9 credits.
Graded on an S/U basis.
ATY 690-INDIVIDUAL WORK. 1 to 5 credits
 Supervised study or research in areas not covered by other graduate courses.
May be repeated with change of content up to a maximum of 10 credits.
ATY 697-SUPERVISED RESEARCH. 1 to 5 credits
 Credit not applicable toward degree. May be repeated.
ATY 698-SUPERVISED TEACHING. 1 to 5 credits
 Credit not applicable toward degree. May be repeated.
ATY 699-MASTER'S RESEARCH. 1 to 17 credits
ATY 741-CLOSE BINARY STARS. 3 credits
 Prerequisite: ATY 646. Role of close binaries in stellar evolution. Non-periodic
phenomena, mass loss and exchange, novae and nova-like variables, period changes.
ATY 799-DOCTORAL RESEARCH. 1 to 17 credits