This disk contains a subset of the Premapping period data from the Mars Global Surveyor (MGS) Magnetometer and Electron Reflectometer (MAG/ER) instruments, submitted to the Planetary Data System (PDS).

Users are encouraged to provide comments back to the PPI Node of the PDS if errors or omissions are found either in data or in documentation. Please send comments by e-mail or U.S. mail to PDS Operator as defined at the end of this document.

Questions regarding data content, processing, or quality should be sent to

Dr. J.E.P. Connerney (jec@lepjec.gsfc.nasa.gov)
NASA Goddard Space Flight Center
Code 695
Greenbelt, MD 20771

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This volume contains MGS MAG/ER data from the Premapping period of the MGS mission. The data on this volume are from the Science Phasing Orbits-2 (SPO-2) subphase of the Orbit Insertion mission phase. The data include Mars data from days 1998-07-19 through 1998-09-22, along with Phobos data from days 1998-05-27 through 1998-09-22.

The data on this DVD are organized into 7 top-level directories named MGSM_1008 through MGSM_1014. Each of these directories is a virtual CD, or "logical volume," having the same directory structure as a PDS data CD-ROM. Users should be able to use the data in any one of these top-level directories as though the directory were the root directory of a separate, standalone CD.

Further information on the contents of the individual logical volumes can be found within the volumes themselves. In particular, see the file AAREADME.TXT under each of the logical volume directories on this DVD.

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The following list shows which days of data are contained in each logical volume on this DVD.

In addition to these logical volumes, this DVD contains a map interface which allows the user to access data by map location using a web browser. The map interface is housed in the top-level EXTRAS directory. To use the interface, open the file EXTRAS/MAP.HTM in your web browser. Use of the map interface is not necessary for use of the data.

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There is a file called ERRATA.TXT, found at the root level of each logical volume, which contains a list of known deficiencies or caveats associated with that volume at the time this disk was published. The file AAREADME.TXT at the root level of each logical volume describes procedures for obtaining an updated errata list and for reporting errors on the volume. If you find an error on this disk, please report it. Only through support and feedback of the users of these data can an effective errata list be maintained.

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The person most directly responsible for the construction and release of this DVD is Dr. Mark Sharlow. He was the data engineer at the time this disk was created and understands as much about the disk structure and data organization as anyone. Other PPI personnel who may be aware of issues related to this DVD include Mr. Steven Joy, the PPI Node Data Administrator, and Dr. Raymond Walker, the PDS/PPI Node manager.

For questions or problems regarding this DVD, please contact the PDS/PPI PDS operator:

Internet: pds_operator@igpp.ucla.edu

Telephone: (310) 206-6073

U.S. Mail:

PDS Operator
c/o Dr. Raymond Walker
3845 Slichter Hall
UCLA - IGPP
Los Angeles, CA 90095-1567

For questions regarding PDS Standards or other disks available from the PDS, please contact PDS Operator at the PDS Central Node (at JPL):

Internet: pds_operator@jpl.nasa.gov

Telephone: (818) 354-4321

U.S. Mail:

Planetary Data System, PDS Operator
Jet Propulsion Laboratory
Mail Stop 202-101
4800 Oak Grove Dr.
Pasadena, CA 91109-8099

The PDS, and the Planetary Plasma Interactions (PPI) Node in particular, assume no legal liability for errors on this disk. All users are encouraged to verify the "correctness" of the data prior to submitting any publications or other work based on these data. Errors on this disk should be reported back to the PPI Node of the PDS through the ERRATA reporting procedures described above.

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