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Showing papers in "Advances in Space Research in 1988"


Journal ArticleDOI
TL;DR: In this paper, the wave telescope and discontinuity analysis of magnetometer data from four spacecraft are used to estimate the local electrrical current density, which is the most commonly used method for determining the current density.

197 citations


Journal ArticleDOI
TL;DR: In this article, a single satellite experiment, AE-E, operated during a portion of solar cycle 21.6 nm, and at wavelengths below 120 nm only one satellite experiment was used to provide a definitive estimate of EUV solar variability.

120 citations


Journal ArticleDOI
TL;DR: In this paper, an empirical model for plasmaspheric low-energy plasma consisting of H(+) was developed from a data base derived from measurements taken by the Retarding Ion Mass Spectrometer on the DE-1 satellite.

118 citations


Journal ArticleDOI
TL;DR: In this article, a linear prediction filtering was used which treated the magnetosphere as a black box characterized by an impulse response, and it was shown that an average impulse response can account for only about 40 percent of the variance in the AL index.

63 citations



Journal ArticleDOI
TL;DR: The results of the ISEE mission indicate the magnetopause is thicker than expected, often ten magnetosheath ion gyroradii or more, and that its characteristic radial motion is usually sub-Alfvenic.

56 citations


Journal ArticleDOI
TL;DR: In this paper, an expansion after orthogonal functions is proposed to reproduce the variations of the given data field by a minimum number of expansion components; these are uncorrelated, i.e. linearly independent of each other.

56 citations


Journal ArticleDOI
TL;DR: This Global Oscillation Network Group (GONG) aims at essentially continuous imaged observations of global solar oscillations for a minimum of three years, which will be used to study the solar interior using helioseismology.

54 citations


Journal ArticleDOI
TL;DR: In this paper, a comprehensive revision of the MSIS-83 earth atmosphere model was undertaken to extend predictions to the mesopause, on the basis of temperature, density, and composition data obtained by sounding rockets, satellites, and incoherent scatter radars.

54 citations


Journal ArticleDOI
TL;DR: In this article, time dependent evolutions of the profile of free surface (bubble shapes) for a cylindrical container partially filled with a Newtonian fluid of constant density, rotating about its axis of symmetry, have been studied.

50 citations


Journal ArticleDOI
TL;DR: In this article, the daily background X-ray fluxes in the form of monthly averages and annually-smoothed (13-month) values are presented for Solar Cycle 21.

Journal ArticleDOI
TL;DR: In this article, it is found that the presently available data base is insufficient in some respects and needs completion, and therefore, it is used with different additional assumptions in a synthetic effort to achieve model profiles.

Journal ArticleDOI
TL;DR: Artificially induced ionospheric holes result from in situ injections of highly reactive molecules, which greatly enhance the chemical recombination rates between the ions and electrons found in the upper atmosphere as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, the authors detected and tracked several classes of traveling vortices in the dayside ionospheric flow using the Greenland magnetometer chain using the modeled ground magnetic signature to measurements from the chain of magnetometers.

Journal ArticleDOI
TL;DR: In this article, the main topics of this paper are: monitoring parameters of the solar wind, diagnosis of the structure and dynamics of the polar cusp, wave regimes connected with eigenoscillations of the magnetosphere and their use for diagnosis, utilization of ULF-waves as an indirect indicator of processes in the Earth's ionosphere and magnetosphere.

Journal ArticleDOI
TL;DR: In this article, a review of multisatellite studies of ULF waves is presented, with a special emphasis on compressional Pc 5 waves, and the observations of the radial extent, azimuthal wave number and the field-aligned standing wave structure of the waves are described.


Journal ArticleDOI
TL;DR: In this article, the authors reviewed the morphology and dynamics of polar cusp and cleft auroras, with emphasis on the IMF influence, and the relationship with convection related currents.

Journal ArticleDOI
TL;DR: In this article, it is argued that the total ionization yield is an inadequate measure of the critical velocity effect, and a new criterion based on eta, the efficiency of energy transfer from the recently ionized neutrals to a heated electron population, is proposed: the effect would be verified if eta values of 10 percent or greater were observed.

Journal ArticleDOI
TL;DR: A development history for the optical probing of the structure of the upper atmosphere is presented in this paper, noting the contributions made by both ground and spaceborne optical sensors, and the role of advancements in thermospheric theory.

Journal ArticleDOI
TL;DR: In this paper, the authors compare the results of the UV Imager onboard the Viking satellite with the Interplanetary Magnetic Field data and find that localized regions of emission can propagate either duskward or dawnward depending on the sign of By.

Journal ArticleDOI
TL;DR: Two-wave MHD populations are seen at collisionless shocks: precursor waves standing in the shock ramp which form an integral part of the shock and upstream waves which are usually attempting to propagate upstream but are carried back toward the shock by the solar wind flow.

Journal ArticleDOI
TL;DR: In this paper, a statistical study of the radial and azimuthal propagation of substorm effects in the near-geosynchronous magnetotail is presented, where data from five spacecraft (AMPTE/CCE, 1979-053, 1982-019, GOES-5, and GOES6) have been used in the study.

Journal ArticleDOI
TL;DR: In this article, it was shown that there is very little convection "flywheel" effect in the dayside polar ionosphere and that only newly-opened flux tubes impart significant momentum to the ionosphere, in a relatively narrow region immediately poleward of the cusp.

Journal ArticleDOI
TL;DR: In this article, a ring cusp contactor is shown to provide from 1000-mA of electron emission to 500-mA of electron collection as its bias relative to a simulated space plasma.

Journal ArticleDOI
TL;DR: In this article, an attempt was made to find and to explain a total relation system between the Sun's motion and the solar variability, which could lead to a physical mechanism of solar variability.

Journal ArticleDOI
TL;DR: In this article, the solar EUV irradiance data base acquired over the past 25 years is briefly described, and the extent to which emissions at different EUV wavelengths and ground-based solar indices are similar, is examined statistically over time scales of the 27-day solar rotation, and less rigorously over the eleven year solar cycle.

Journal ArticleDOI
TL;DR: The core-to-wing ratio R(MgIIc/w) is presented for 27 May 1986 through 31 May 1988 as discussed by the authors, which is a little less than half the decline from NIMBUS7 from solar maximum to minimum during solar cycle 21.

Journal ArticleDOI
TL;DR: The continuous-wave frequency-modulated ionosonde that was developed at SibIZMIR, has been used as an automatically-controlled real-time data gathering and processing system.

Journal ArticleDOI
TL;DR: In this article, the properties of four potential sources for energetic ions and electrons in the magnetosheath are considered: upstream Fermi acceleration and shock drift acceleration of incident solar wind particles at the bow shock.