Search Publications
Investigation of the polytropic relationship between density and temperature within interplanetary coronal mass ejections using numerical simulations
Riley, Pete; Gosling, J. T.; Pizzo, V. J.
Single-point spacecraft measurements within coronal mass ejections (CMEs) often exhibit a negative correlation between electron density and temperature. At least two opposing interpretations have been suggested for this relationship. If, on one hand, these single spacecraft observations provide direct measures of the polytropic properties of the p…
Viewing corotating interaction regions globally using energetic neutral atoms
Hsieh, K. C.; Hilchenbach, M.; Czechowski, A. +2 more
We present model simulations to estimate the flux of 25-100 keV energetic neutral atoms (ENAs) that can be expected from charge exchange between the ion populations accelerated at corotating interaction regions and the slow neutral atoms penetrating from the local interstellar matter. The extended structure of a corotating interaction region (CIR)…
Magnetometer measurements from the Cassini Earth swing-by
Russell, C. T.; Dougherty, M. K.; Balogh, A. +9 more
Magnetometer data recorded by the Cassini spacecraft during the spacecraft's Earth swing-by maneuver in August 1999 are discussed. The primary purpose of this paper is to show the instrument's performance in detection of magnetic phenomena in a planetary environment. Companion papers put the data in a broader geophysical context. The low noise and…
Oblique ``1-Hz'' whistler mode waves in an electron foreshock: The Cassini near-Earth encounter
Dougherty, Michele K.; Neubauer, Fritz M.; Tsurutani, Bruce T. +8 more
The Cassini spacecraft flew toward the Earth in a trajectory almost along the Sun-Earth line, giving a unique perspective of low-frequency plasma waves in the Earth's foreshock. At the time of the fly-through, the angle between the magnetic field and Sun-Earth direction was ~70°. For this orientation, only the most energetic (>=12 keV) ions cou…
Wave normal and Poynting vector calculations using the Cassini radio and plasma wave instrument
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +4 more
Wave normal and Poynting vector measurements from the Cassini radio and plasma wave instrument (RPWS) are used to examine the propagation characteristics of various plasma waves during the Earth flyby on August 18, 1999. Using the five-channel waveform receiver (WFR), the wave normal vector is determined using the Means method for a lightning-indu…
Correlation of solar wind parameters between SOHO and Wind
Lazarus, A. J.; Coplan, M. A.; Ogilvie, K. W. +3 more
We describe and interpret new results obtained by correlating measurements of solar wind speed, density, and flux made by the plasma instruments on the SOHO and Wind spacecraft at separations between +/-150 Earth radii (RE) in the Y (GSE) direction and up to 280 RE in the X (GSE) direction. These measurements cover the period…
Cassini plasma spectrometer electron spectrometer measurements during the Earth swing-by on August 18, 1999
Coates, A. J.; Linder, D. R.; Thomsen, M. +5 more
On August 18, 1999, Cassini flew by the Earth on its way to Saturn. The Cassini Earth swing-by was the fastest traversal of the Earth's magnetosphere to date. The spacecraft was traveling at 9.1REhr-1 (16.1 km s-1) and made rapid traversals of several regions of the terrestrial magnetosphere. During the Cassini Ear…
Observations of two complete substorm cycles during the Cassini Earth swing-by: Cassini magnetometer data in a global context
Kurth, W. S.; McComas, D. J.; Lester, M. +13 more
During the Earth swing-by of the Cassini spacecraft, a worldwide program of data-gathering was undertaken to define the prevailing interplanetary and geophysical conditions. This included observations of the interplanetary medium, outer magnetosphere, geostationary orbit, UV aurora, geomagnetic disturbance, and ionospheric flow. These data show th…
The Cassini/Huygens Venus and earth flybys: An overview of operations and results
Burton, M. E.; Matson, D. L.; Buratti, B. +1 more
The Cassini/Huygens spacecraft flew by Venus on June 24, 1999, and the Earth on August 18, 1999. These two events provided the Cassini Project with its first opportunities to design coordinated scientific observations at planetary encounters. In addition to exercising capabilities of the science instruments as well as the spacecraft and performing…
An overview of observations by the Cassini radio and plasma wave investigation at earth
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +6 more
On August 18, 1999, the Cassini spacecraft flew by Earth at an altitude of 1186 km on its way to Saturn. Although the flyby was performed exclusively to provide the spacecraft with sufficient velocity to get to Saturn, the radio and plasma wave science (RPWS) instrument, along with several others, was operated to gain valuable calibration data and…