3-D IPS Tomography

The image and a 1.0 Mbyte *.avi or a 1.2 Mbyte quicktime video presentation is a view of inner heliospheric plasma density (to 1.5 times the distance of the Earth from the Sun) derived from a combination of interplanetary scintillation (IPS) intensity level and velocity data. The data were obtained from June 23, 1994 to July 20, 1994 (Carrington Rotation 1884). The plasma density is normalized to the value of the distance of the Sun from Earth by the removal of a 1/r squared distance dependence. The Sun is depicted as a dot in the center of the figure, and the Earth, a blue dot on it's orbit around the Sun. The view is from 30 degrees above the heliographic equator.

The image is obtained from a three-dimensional tomographic reconstruction of the plasma from perspective views of it available from outward motion of the plasma and solar rotation as explained by Jackson et al., 1996. The scintillation intensity level is calibrated in terms of density by comparison with IMP spacecraft densities at Earth. Observations are least-squares fit over the period of one solar rotation. Because of this limitation, only the corotating component of the heliospheric plasma density can be reconstructed from the data. Clearly seen is the three-dimensional Archimedean spiral structure of the dense heliospheric components of the solar wind during this solar minimum period.

There is also a 3.0 Mbyte *.avi or a 2.5 Mbyte quicktime video depiction of a FIRE (Solar Probe) fly-through of this data set available.