Please note:
If you acquire GPS radio occultation data, we ask that you acknowledge us in your use of the data.
This may be done by including text such as GPS radio occultation data provided by Research Institute for Sustainable Humanosphere
of Kyoto University.
We would also appreciate receiving a copy of the relevant publications.
Thank you!
IUGONET also prepared the
iUgonet Data Analysis Software (UDAS)
for the upper atmospheric observation data.
If you install the
UDAS,
you can easily access, download, visualize and analyze the MU radar observation data through the Internet.
Please click and try to use the
UDAS.
The Global Positioning System (GPS) radio occultation (GPS-RO) technique is an active limb sounding observation of the Earth's atmosphere
using a GPS receiver onboard a low Earth orbit (LEO) satellite. Since the observation data taken by such technique have high accuracy
and excellent height resolution, they are very useful for analyzing atmospheric structures including small-scale
vertical fluctuations in the troposphere and stratosphere. The vertical resolution of the geometrical optics (GO)
method [Kursinski et al., 1996] in the stratosphere is about 1.5 km due to Fresnel radius limitations, but full
spectrum inversion (FSI) [Jensen et al., 2003] can provide superior resolutions. The archived GPS-RO data have been
calculated applying FSI to COSMIC GPS-RO profiles in an altitude from ground level up to 30 km. The original COSMIC GPS-RO profiles are open on the
UCAR homewebpage (http://cdaac-www.cosmic.ucar.edu/cdaac/products.html#cosmic). The height resolution of archived data is 0.1 km and we averaged the original
RISHANA data (refractivity, pressure, temperature, and tangential point of latitude and longitude) in a bin of +/-0.05 km for nominal height. If you want to know details of data
description and FSI, please refer to the paper [Tsuda et al., 2011].
Reference
1. Tsuda, T, X. Lin, H. Hayashi, and Noersomadi, Analysis of vertical wave number spectrum of atmospheric gravity waves in the stratosphere using COSMIC GPS radio occultation data, Atmos. Meas. Tech., 4, 1627 - 1636, doi:10.5194/amt-4-1627-2011, 2011.
2. Kursinski, E., G. Hajj, , W. I. Bertiger, S. S. Leroy, T. Meehan, L. Romans, J. Schofield, D. McCleese, W. Melbourne, C. Thornton, T. Yunck, J. Eyre, and R. Nagatani: Initial results of radiooccultation observations of Earth's atmosphere using the Global Positioning System, Science, 271, 1107 - 1110, 1996.
3. Jensen, A. S., M. S. Lohmann, H.-H. Benzon, and A. S. Nielsen, Full Spectrum Inversion of radio occultation signals, Radio Sci., 38, 1040, doi:10.1029/2002RS002763, 2003.