You are here:
- Home
- Science
- Physics
- Astrophysics
- Philip A. Stahl
Astrophysics/Expert Profile
Expertise
I specialize in stellar and solar astrophysics. Can answer any questions pertaining to these areas, the spectroscopic analysis of stars – as well as the magneto-hydrodynamics of sunspots and solar flares. Sorry – No homework problems done or research projects! I will provide hints on solutions.
Experience in the area
Have published papers on the relationship between sunspot morphology and solar flares; discovery of SID flares related to this, constructed computerized stellar models; MHD research.
Organizations
American Astronomical Society (Solar physics and Dynamical astronomy divisions), American Geophysical Union, American Mathematical Society, Intertel.
Publications
Solar Physics, Journal of the Royal Astronomical Society of Canada, Journal of the Barbados Astronomical Society, Meudon Solar Flare Proceedings (Meudon, France)
Education/Credentials
B.A. degree in Astronomy; M.Phil. degree in Physics - specializing in solar physics.
Awards and Honors
Postgraduate research award- Barbados government; Studentship Award in Solar Physics - American Astronomical Society
Average Ratings
Recent Reviews from Users
K = Knowledgeability C = Clarity of Response P = Politeness| User | Date | K | C | P | Comments |
|---|---|---|---|---|---|
| Greg | 02/02/12 | 10 | 10 | 10 | Thanks for your time, from another atheist ..... |
| Ric | 01/18/12 | 10 | 10 | 10 | I'm a layman with limited knowledge ..... |
| Droog | 01/05/12 | 10 | 10 | 10 | Thanks! That is just what I needed! ..... |
| Droog | 01/03/12 | 10 | 10 | 10 | Thanks so much! The original answer and ..... |
| Peter | 10/21/11 | 10 | 9 | 10 |
Recent Answers from Philip A. Stahl
2012-01-31 Astonomy / Physics:
Hello, Okay, let's make it more concrete using the problem below - with the accompanying diagram as a reference. Problem: A student draws a sketch with square units in centimeters (Fig. 1) of
2012-01-31 Astonomy / Physics:
Hello, This sounds suspiciously like a homework problem which I don't do. However, I can provide some assistance to enable you to complete the solution on your own. The semi-major axis, a, which
2012-01-27 Time dilation and expansion of the universe:
Hello, You raise an intriguing question and one which, certainly at first glance, appears to have or suggest serious gaps in our perceptions or knowledge, especially regarding cosmic inflation and the
2012-01-12 Ric Ross questioin -infinite gravitational force:
Hello, "Infinite gravitational force" is kind of a poor description of what's going on. Also, the new M-brane collision theory for the origin of the Big Bang kind of eliminates most discussions of "singularities"
2012-01-04 Auroral magnetic bottle problem:
Hello, Okay, like the previous solution I provided for your self-study this is fairly straightforward. You are given the mirror ratio, which we know is: R_m = [B (max)/ B(min)] = 20 e.g. B(max)
©2012 About.com, a part of The New York Times Company. All rights reserved.