Our research projects are supported by  NASA grants NAG5-5249,
NAG5-5308, NAG5-5347, NAG5-5204 and NSF grant PHY0101149.

We thank the NASA Wallops Flight Facility for Ultra Long Duration Balloon
Support System, the National Scientific Balloon Facility for balloon flight
support, the National Science Foundation Office of Polar Programs for
Antarctic science program support, and the Raytheon Polar Service
Company for the Antarctic logistics support.

Any opinions, findings and conclusions or recommendations expressed in
this material are those of the authors and do not necessarily reflect
the views of the NSF or NASA.