Mars '94 Small Station/Pluto Fast Flyby Triaxial Magnetometer
This paper describes a small-weight and low-power magnetometer that was designed and built for the Mars '94 mission.
low-power magnetometer↗
Engineering topics
Tsurutani, B.
Publications and source records attributed to Tsurutani, B..
Electromagnetic Waves with Frequencies Near the Local Proton Gryofrequency: ISEF-3 1 AU Observations
Low Frequency electromagnetic waves with periods near the local proton gyrofrequency have been detected near 1 AU by the magnetometer onboard ISEE-3. For these 1 AU waves two physical processes are possible: solar wind pickup of nuetral (interstellar?) particles and generation by relativistic electron beams propagating from the Sun.
exchange interstellar ions local ion cyclotron fre↗
Particle Interactions With Obliquely Propagating Magnetosonic Waves: Energization and/or Trapping
Four cases of nonlinear obliquely propagating MS waves are considered using a test particle approach: i) monochromatic waves propagating both sunward and anti-sunward, ii) monochromatic waves propagating unidirectionally towards the Sun, iii) a broad band spectrum, propagating both sunward and anti-sunward, iv) a broad band spectrum, propagating sunward only.
Comets particle scattering Magnetosonic waves↗
Nonlinear Low-Frequency (LF) Cometary Waves
This paper presents a review of nonlinear properties of low-frequency waves at comets.
low-frequency magnetosonic waves nonlinear plasma ↗
The Future of Geomagnetic Storm Predictions: Implications From Recent Solar and Interplanetary Observations
This paper presents a review of cutting-edge efforts that expose important unanswered questions that must be answered before true predictability of storms can be possible.
geomagnetic storms solar wind coronal madd ejectio↗
Investigation of Possible Electromagnetic Disturbances Caused by Spacecraft-Plasma Interactions at 4 R Subscript s Small Solar Probe
The proposed Small Solar Probe mission features a close approach to the sun with a perihelion of 4 R subscript s. Carbon molecules emitted from the spacecraft's heat shield will become ionized by electron impact and photoionization.
Small Solar Probe electromagnetic and electro-stat↗
Numerical Solution of Wave Equations for the Stability of Inner Cometo-Sheath
Numerical solution of the MHD wave equations for stability of the cometary sheath determined by the balance between the inward Lorentz body force and the outward ion-neutral drag force is obtained by using a two-point boundary value method.
comets↗
Plasma Waves Downstream of Weak Collisionless Shocks
This paper describes plasma wave electric field measurements in the region immediately downstream of several typical quasi-parallel and quasi-perpendicular flank skocks.
plasma↗
Acceleration of Cometary H 2 0 Group Pickup Ions by Obliquely Propagating Nonlinear Magnetosonic Waves
The observations made during the encounter with comet Giacobini Zinner show that the character of MHD turbulence is governed by the magnetosonic (MS) waves generated by the pickup ions via a resonant cyclotron instability. We have performed the test particle calculations to study wave particle interactions via cyclotron resonance of water group cometary ions with (1) linearly polarized monochromatic MS waves, (2) circularly polarized monochromatic MS waves, and (3) magnetic fluctuations consisting of MS waves with a power spectrum which varies as 1 / k 2 .
magnetosonic↗
Magnetic and Electric Field Waves in Slow Shocks of the Distant Geomagnetic Tail: ISEE 3 Observations
This paper describes ISEE 3's first pass through the distant geomagnetic tail, during which the slow shocks encountered on February 2 and 11, 1983, provided particularly clear examples of the magnetic field and plasma wave properties of the shock transition.
magnetic↗
Scientific objectives of a Solar Probe mission
The Solar Probe is a mission of exploration and discovery in an uninvestigated region near the sun. The Solar Probe can enhance general understanding of the corona and the solar wind. The first in situ measurements of coronal particles and fields are expected to provide definitive discriminators among many currently proposed models of processes that shape the structure and dynamics of the outer corona and solar wind. In addition, observations of the development of turbulence, nonlinear wave processes, plasma heating, and particle acceleration in the corona can advance these areas of plasma physics in a regime neither duplicated by earth-based laboratories nor by previous space exploration. It also fills the last gap between knowledge of the terrestrial response to solar output as well as provide insight for interpreting observations of general stellar envelopes.
Feldman, W.↗
Asessment of the boundary layer model of the magnetospheric substorm
Data on energetic protons, thermal electrons, and magnetic field characteristics obtained by the ISEE 3 in the magnetotail at the distance of 80 R(E) from the earth were analyzed. Many features were found that were present in the ISEE 1 and 2 data. In particular, flow directions of the plasma observed at 80 R(E) were found to be quite consistent with the formation of the near-earth neutral line during the expansion phase, giving further support to the near-earth reconnection model of the magnetospheric substorm described by Eastman et al. (1985).
Nishida, A.↗
Shock acceleration of nucleons at 16 deg and above solar latitude associated with interplanetary corotating interaction regions
The analysis of magnetic field and nuclei measurements in the 1 to 10 MeV/nucleon range for protons and helium at about 16 deg N solar latitude near solar cycle minimum (1975-76) shows both: (1) that nucleons are accelerated locally in corotating shocks, and (2) that the associated recurring corotating interaction regions (CIRs) at about 16 deg latitude have approximately the same temporal and spatial parameters found for CIRs in the equatorial plane at radial distances less than 5 AU. The evidence indicates that both the CIR structures and nucleon acceleration by shocks extend to intermediate solar latitudes and are likely to be observed during the Ulysses Mission out of the ecliptic plane.
Simpson, J. A.↗
Magnetic fields on the sun and the north-south component of transient variations of the interplanetary magnetic field at 1 AU
In order to study the relationship between solar magnetic fields and the transient variations of the north-south component B(Z) of the interplanetary magnetic field (IMF) at 1 AU, flares from unusual north-south oriented active regions, large IMF B(Z) events, and large flares with comprehensive flare index higher than 12 were collected. The associated IMF B(Z) changes or the magnetic field of the initiating flares are investigated. For those cases where an association between a transient B(Z) variation and an initiating flare is plausible, it is found that, for a given flare field, the orientation of the corresponding transient variation of B(Z) may be in agreement with the flare field, opposite to it, or more often, fluctuating in both magnitude and direction. Conversely, an IMF B(Z) event may originate in a flare field in the same magnetic orientation, opposite to it, or in the east-west orientation.
Tang, F.↗
Solar wind variations and geomagnetic storms - A study of individual storms based on high time resolution ISEE 3 data
Two independent methods are employed to determine the relationship between the parameter epsilon and total energy dissipation rate of the magnetosphere U sub T by selecting disturbed periods from the same data d set used by Baker et al. (1983). Specifically, four storms are examined in detail, since the accuracy of estimating U sub T is significantly improved during disturbed periods. The first method assumes that U sub T = M sub A exp.2- alpha(epsilon) where M sub A is the Alfven Mach number and alpha varies with time. The second method considers a linear, time-invariant dynamic system with epsilon as input and U sub T as output. This means that U sub T = W(asterisk)epsilon where asterisk is the convolution and W is a transfer function characteristic of the system. It is found that alpha values fluctuate mainly between 0 and -0.25. The transfer function analysis indicates that W often resembles a delta-function or a narrow rectangular impulse. Both results give the same implication (namely that U sub T is approximately equal to epsilon) and thus are consistent with the view that the magnetosphere is primarily a directly driven system during disturbed periods.
Akasofu, S.-I.↗
Unusual auroral features observed on January 10-11, 1983 and their possible relationships to the interplanetary magnetic field
Intense perturbations observed in the auroral oval by the DMSP satellite on Jan. 10, 1983 are analyzed for possible influences by the IMF. The oval shrank in the early afternoon and was accompanied by intense activity in the morning sector. The latter feature was rare and occurred during relative quiescence in the evening sector, which exhibited a smaller width than the morning sector. Simultaneously, the ISEE-3 and IMP-8 spacecraft recorded large negative By values and positive Bz values in the magnetotail, assumed to be caused by activity of the IMF. The asymmetry in the oval is attributed to the negative By component, which has previously been proven to shift the open region to the evening sector. The asymmetry appeared, however, only when the Bz component attained large positive values.
I-Akasofu, S.↗
Substorm warnings - An ISEE-3 real time data system
The use of solar wind measurements made by ISEE-3 in its halo orbit around the L1 libration point to predict the onsets of magnetospheric substorms and geomagnetic storms is discussed. Consideration is given to the limitations on the predictive ability of the satellite measurements set by the bulk solar wind velocity, the elliptical orbit of the satellite and the correlation lengths of the magnetic field and the solar wind plasma. The ISEE-3 real-time data system is presented, with attention given to the ground receiving stations, the NASCOM communications system, the Multisatellite Operations Control Center and Information Processing Division at the Goddard Space Flight Center, the link between Goddard and the NOAA Space Environmental Services Center, and the NOAA Space Environment Laboratory data acquisition and display data system, which includes displays allowing storm forecasts. It is noted that the entire system should be operational by March, 1980.
Tsurutani, B.↗
A study of the compatibility of science instruments with the solar electric propulsion space vehicle
Electromagnetic interference and field-of-view constraints are identified as the areas of most concern to science on solar electric propulsion space vehicles. Several areas are indicated which more detailed data on the space vehicle environment are needed. In addition, possible means to attain or demonstrate science/space vehicle compatibility are recommended for further iteration between space vehicle design and science payload considerations. The space vehicle design developed by the solar electric propulsion system integration technology effort is used. Two payload sets for comet Encke missions (a slow flyby and a rendezvous), as well as several instruments which are not included in the two payload sets, are analyzed to determine requirements on the space vehicle imposed by the instruments in order to meet their objectives. Environmental requirements for the sets of instruments are developed and compared to both the SEPSIT design criteria and the environment as it is presently understood.
Parker, R. H.↗