Ørsted Newsletter #10, 2001 (September 24)

Table of Contents

1. New Level of Ørsted Vector Data
2. New Vector Data Released

1. New Level of Ørsted Vector Data

Ørsted magnetic vector data have now reached Level 2.3.

The only difference between Level 2.2 and Level 2.3 is the timing of the Star Imager (SIM) attitude data, which have now been corrected to the final level of accuracy. Level 2.2 attitude data have a general timing error of 15 ms, however in many periods the accuracy is better than 1 ms, but occasional errors of seconds, minutes, hours, and even days exist. The timing error of Level 2.3 attitude data should be below 1 ms.

The difference in the end product, the magnetic vector data, is generally insignificant between Level 2.2 and 2.3. A timing error of 15 ms in the attitude data translates into an error around 1-2 nT in the magnetic vector data.

Currently, the only Ørsted vector data at Level 2.3 are the ones released now as described below. Data currently available at Level 2.2 will be raised to Level 2.3, however slowly especially for the early periods of Ørsted data, since these contain a large number of deficient timing-error-corrections.

2. New Vector Data Released

Ørsted data from October 13, 1999 through November 25, 1999 and from June 26, 2001 through September 4, 2001 have been corrected and is available as MAG-R and preliminary MAG-L data files. These data are the first, and yet only, data at Level 2.3 (cf. above).

The currently available periods of Ørsted magnetic vector data at Level 2.2 or 2.3 are:

1. April 20, 1999 through May 28, 1999
2. June 21, 1999 through June 23, 1999
3. July 15, 1999 through July 21, 1999
4. August 10, 1999 through August 20, 1999
5. August 25, 1999 through February 21, 2000
6. March 3, 2000 through April 18, 2000
7. May 26, 2000 through June 9, 2000
8. November 8, 2000 through September 4, 2001