# Plasma Parameter Plots from ISEE 3 Data Pool Data on Microfiche

**NSSDCA ID:** SPHE-00074

**Availability:** At NSSDC, Ready for Offline Distribution (or Staging if Digital)

**Time span:** 1978-08-12 to 1984-03-02

## Description

Each frame of this microfiche data set contains 24-h plots of five plasma parameters, and it is labeled with the start and end dates, the date of production, the corresponding ISEE 1 and 2 orbit number and orbital phase, and the ISEE 3 position at the start of the plot in GSE and GSM coordinates in units of earth radii. For use in estimating the time delay, or at least the order of magnitude of the time delay of magnetic field phenomena between ISEE 3 and the earth, three estimates have been plotted. The simplest and probably the least correct, labeled TV, is shown in the middle panel of each frame. It is simply the distance between ISEE 3 and the earth divided by the solar wind velocity. In the second panel, TC is approximately the corotation time. It was assumed that planes of constant interplanetary conditions are convecting to the earth. These planes are perpendicular to the ecliptic plane and contain the magnetic field direction. In the top panel, TD relaxed the assumption that the plane must be perpendicular to the ecliptic plane. Rather, this calculation assumed that the planes are defined by the magnetic field direction and the Parker spiral direction cosines (.707, -.707, 0). These planes can have quite varied directions. Note that to avoid rather noisy plots these calculations were performed only every 5 min on 5-min averages. The second plot from the bottom shows the logarithm of the magnetosonic Mach number. A constant sound velocity of 57 km/s has been assumed in this calculation. The bottom panel shows the logarithm of plasma beta. Again, a constant total temperature for the plasma has been assumed (230,000 K).

## Discipline

- Space Physics: Heliospheric Studies

## Old NSSDCA ID

## Additional Information

### Spacecraft

### Experiments

Questions or comments about this data collection can be directed to:
Dr. H. Kent Hills.

## Personnel

Name | Role | Original Affiliation | E-mail |
---|

Dr. Christopher T. Russell | General Contact | University of California, Los Angeles | ctrussell@igpp.ucla.edu |