Data are property of Iridium Satellite and are provided to JHU/APL for scientific research under a non-disclosure agreement.

Derived products are released and science results published with concurrence of Iridium Satellite.

Data have been provided to JHU/APL beginning since Feb 18, 1999 and continuing to the present.

Figure 3. This figure summarizes the data coverage and magnetometer sampling/record intervals for March 9- 10, 1999. Top panel shows the number of satellites that recorded magnetometer data in a given 1/2 hour bin (green) and the number of satellites that had a gap of at least 10 minutes in the magnetometer time series (red). Middle panel shows the minimum (gray), average (blue) and maximum (black) time interval between samples averaged on each satellite in each 1/2 hour bin. That is, a minimum of 20 seconds means that at least one satellite recorded data at an average rate of one sample every 20 seconds during that 1/2 hour period. Bottom panel shows the distribution of time intervals between successive recorded samples. The most common time sample is 185 seconds although significant data are recorded more often than one sample per minute. Since July 20 1999 the data are continuous and do not display the twice daily gaps evident here from 1200-1300 UT and 0000-0200 UT.

Figure 3