dc.contributor.author | Besson, David Zeke | |
dc.contributor.author | Kravchenko, I. | |
dc.date.accessioned | 2014-11-21T18:51:22Z | |
dc.date.available | 2014-11-21T18:51:22Z | |
dc.date.issued | 2013-05-16 | |
dc.identifier.citation | Besson, D. and Kravchenko, I.: Radio-frequency probes of Antarctic ice at South Pole, The Cryosphere, 7, 855-866, http://dx.doi.org/10.5194/tc-7-855-2013 2013. | |
dc.identifier.uri | http://hdl.handle.net/1808/15840 | |
dc.description.abstract | Using hardware developed for the ARA (Askaryan Radio Array) particle astrophysics experiment, we herein report on the amplitude and temporal characteristics of polarized surface radar echo data collected in South Polar ice using radio sounding equipment with 0.5-ns echo-time sampling. We observe strong echoes at 6, 9.6, 13.9, 17, and 19 μs following vertical pulse emission from the surface, corresponding to reflectors in the upper half of the ice sheet. The synchronicity of those echoes for all broadcast azimuthal polarizations affirms the lack of observable birefringence over the upper half of the ice sheet. Of the five strongest echoes, three exhibit an evident amplitude correlation with the local surface ice flow direction, qualitatively consistent with measurements in East Antarctica. Combined with other radio echo sounding data, we conclude that observed birefringent asymmetries at South Pole are generated entirely in the lower half of the ice sheet. By contrast, birefringent asymmetries are observed at shallow depths in East Antarctica. | |
dc.description.sponsorship | The authors particularly thank Chris Allen
and John Paden (University of Kansas), John Ralston (University
of Kansas), Rebecca Boon (Pennsylvania State University), Joe
MacGregor (University of Texas), and Kenny Matsuoka (Norwegian
Polar Institute) for very helpful discussions, as well as our
colleagues on the RICE and ANITA experiments. We also thank
Andy Bricker of Lawrence High School (Lawrence, KS) for his
assistance working with Lawrence High School students who
performed essential antenna calibrations. This work was supported
by the National Science Foundation’s Office of Polar Programs
(grant OPP-0826747) and QuarkNet programs. Any opinions,
findings, and conclusions or recommendations expressed in this
material are those of the author(s) and do not necessarily reflect the
views of the National Science Foundation. | |
dc.publisher | Copernicus Publications on behalf of the European Geosciences Union. | |
dc.title | Radio-frequency probes of Antarctic ice at South Pole | |
dc.type | Article | |
kusw.kuauthor | Besson, David Zeke | |
kusw.kudepartment | Department of Physics and Astronomy | |
kusw.oastatus | fullparticipation | |
dc.identifier.doi | 10.5194/tc-7-855-2013 | |
kusw.oaversion | Scholarly/refereed, publisher version | |
kusw.oapolicy | This item meets KU Open Access policy criteria. | |
dc.rights.accessrights | openAccess | |