coronal polarization measurements and associated observations from the june, 2001, solar eclipse
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Coronal Polarization Measurements and Associated Observations from the June, 2001, Solar Eclipse. Roban H. Kramer ([email protected]) Swarthmore College 2003 Dr. Jay M. Pasachoff, Williams College. The right place at the right time. Path of Totality. - PowerPoint PPT PresentationTRANSCRIPT
Coronal Polarization Measurements and Associated Observations from the
June, 2001, Solar Eclipse
Roban H. Kramer ([email protected])
Swarthmore College 2003
Dr. Jay M. Pasachoff, Williams College
Path of Totality The right place at the right time
Williams College Expedition eclipse image: Kathleen Gibbons, Daniel Seaton, Stephan Martin, and Jay Pasachoff; TXI Rocket image:
Smithsonian Astrophysical Observatory / Leon Golub
Components of the Corona
The three components
K-Corona
E-Corona
F-Corona
From Goulub, Leon and Pasachoff, Jay M. 1997, The Solar Corona. Cambridge University Press, New York
ObservationsLocal time Duration Filter
configuration15:10:23 1s polar 015:10:28 1s polar 015:10:32 1s polar 015:10:36 3s polar 015:10:43 3s polar 0
15:10:50 1s polar 4515:10:54 1s polar 4515:10:59 1s polar 4515:11:03 3s polar 4515:11:10 3s polar 45
15:11:17 1s polar 9015:11:21 1s polar 9015:11:25 1s polar 9015:11:30 3s polar 9015:11:36 3s polar 90
15:11:59 1s Jupiter15:12:03 1s Jupiter15:12:08 3s Jupiter15:12:14 3s Jupiter
The angle of polarization:
ca
cab
II
III
2
2tan
The fraction of polarization:
22 sincos
cap
III
2sin2/)2sin1(
cbp
III
2cos2/)2sin1(
abp
III
Images taken through three polarizing filters oriented at 45 degree intervals can be used to determine the degree of
polarization and the polarization angle.
Maps
Reduction of the 3-second exposures will improve measurements of polarization angle and degree at greater than 2.5 solar radii.
Radiometric calibration will allow
the comparison of photometric results with other observations
as well as improving the precision of our polarization measurements and the separation of the K- and F- coronas.
Further Research
AcknowledgmentsI would like to thank professor Jay Pasachoff for choosing me to
share the incredible experience he organized, R. Lee Hawkins for supervision the experiment, Shoshana Clark for her joyful collaboration, Mike Gioiello for his preparatory work, and the whole 2001 Williams College eclipse team for an extremely enjoyable and productive environment. I'd also like to thank Gabe Brammer, Kate Gibbons, Mike Gioiello, Dan Seaton and Roger Cohen for helping with my work and play all summer. Swarthmore professors Eric Jensen and David Cohen deserve much of the credit for getting me into this project in the first place.
The Keck Northeast Astronomy Consortium provided funding for my participation in this project, for which I am very grateful. Support for the expedition also came from the Atmospheric Sciences Division of the National Science Foundation and the Committee for Research and Exploration of the National Geographic Society.