SNOE Data Download Center

Introduction

This page is meant as support for the SNOE NSSDC datasets, supplying documentation and data.

The two instruments on SNOE are the Solar X-ray Photometer (SXP) and the Ultra-Violet Spectrometer (UVS).

Notice: As of September 26, 2004, the data has been updated to SNOE Version 2 Data.

Comparison of Version 1 and Version 2 SNOE databases

In the preparation of the Version 1 nitric oxide database, we used a value for the g-factor of the (0,1) nitric oxide gamma band of 2.25 x 10-6 photons/sec-molecule [Barth et al., 2003]. We took into account the varying heliocentric distance of the Earth. The solar flux at 226 nm was taken from measurements by the Spacelab 2 SUSIM instrument.

In the preparation of the Version 2 nitric oxide database, we used a value for the g-factor of 2.62 x 10-6 photons/sec-molecule [Barth et al., 2004]. We took into account the varying heliocentric distance of the Earth and we used daily values of the solar flux at 226 nm measured by the SOLSTICE instrument on UARS. We have adopted the Stevens [1995] g-factors as normalized to SOLSTICE on February 25, 1992.

The ratio between the Version 1 g-factor and the Version 2 database is 0.856.

References
Barth, C. A., K. D. Mankoff, S. M. Bailey, and S. C. Solomon, Global observations of nitric oxide in the thermosphere, J. Geophys. Res., 108(A1), 1027, doi:10.1029/2002JA009458, 2003.

Barth, C. A. and S. M. Bailey, Comparison of a thermospheric photochemical model with SNOE observations of nitric oxide, J. Geophys. Res., doi:10.1029/2003JA010227, 2004.

Stevens, M. H., Nitric oxide gamma band fluorescnt scattering and self-absorption I the mesosphere and lower thermosphere, J. Geophys. Res., 100, 14,735-14,742, 1995.

Available on the SNOE Data Publications page.

Documentation

You can download the entire documentation set in either gzipped tar (unix) or zip (windows) format.

AAA_README.TXT [ Introduction ]
PROCESSING.TXT [ Description of processing ]
FILE_USAGE_ASCII.TXT [ How to use the ASCII files ]
- FILE_USAGE_L3.JPEG [ Graphical view of L3 ASCII file ]
- FILE_USAGE_L4.JPEG [ Graphical view of L4 ASCII file ]
FILE_USAGE_NCDF.TXT [ How to use the NetCDF files ]
FILE_USAGE_DAT.TXT [ How to use the IDL binary .DAT files ]
SXP.TXT [ Description of the SXP data set ]
APPENDIX_A.TXT [ Definition of acronyms ]
APPENDIX_B.TXT [ Known anomalies in data set ]
APPENDIX_C.TXT [ Description of SNOE orbit in southern hemisphere ]
APPENDIX_D.TXT [ Known hardware and software compatibilities ]
VERSION2.TXT [ Description of the difference between V1 and V2 ]

For help with the science instruments onboard the spacecraft, and descriptions of the orbit and trajectory, visit the SNOE website: http://lasp.colorado.edu/snoe/

For more help with the data products produced by the spacecraft, and the UVS in particular, visit the SNOE Data website: http://lasp.colorado.edu/snoedata/

Data

Note: If clicking on a link to a data file causes problems, please use one of these three solutions

Hold the SHIFT key down, click on the link
Mac: Click and hold on the link, choose "Save..." from the menu
Unix/Win: Click on the link with right button. Choose "Save..." from menu

The SNOE SXP dataset is availabe in both ASCII and NetCDF format. Additional documentation is available, and includes images and references for further information.

The SNOE UVS has multiple dataset levels. Read the PROCESSING.TXT, along with FILE_USAGE_ASCII.TXT and/or FILE_USAGE_NCDF.TXT (above) to decide what dataset level(s) you would like.

The ASCII data can be downloaded from
ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/snoe/

The NCDF data and IDL binary .DAT files can be downloaded from
http://lasp.colorado.edu/snoedata/download/data/

An ancillary dataset containing the
Beta Angle, Beta Hour Angle, MLT, and MLT Hour.

Contact

Scott Bailey
baileys@vt.edu