Magnetic fields in the Universe
... components but a remarkably constant piece of µG strength. The question of age is still open and depends of the generating mechanism. Nothing is known about it. However We have some limits at different periods that we will discuss. Again these limits make assumptions: if coupling constants varied wi ...
... components but a remarkably constant piece of µG strength. The question of age is still open and depends of the generating mechanism. Nothing is known about it. However We have some limits at different periods that we will discuss. Again these limits make assumptions: if coupling constants varied wi ...
Lecture 1: Introduction to Electromagnetism
... • How an electric field is produced by charges (Lectures 2-5) • How a magnetic field is produced by currents (Lectures 7-9) • How these fields are modified in materials (Lectures 6, 11) • Electromagnetic forces and their applications (Lecture 10) • How a changing magnetic field produces an electric ...
... • How an electric field is produced by charges (Lectures 2-5) • How a magnetic field is produced by currents (Lectures 7-9) • How these fields are modified in materials (Lectures 6, 11) • Electromagnetic forces and their applications (Lecture 10) • How a changing magnetic field produces an electric ...
of the field.
... (i) Increasing the current (ii) Increasing the number of turns on the coil (iii) A soft ferromagnetic (e.g. iron) core. Solenoids of this ...
... (i) Increasing the current (ii) Increasing the number of turns on the coil (iii) A soft ferromagnetic (e.g. iron) core. Solenoids of this ...
Magnet - Ms. Gamm
... When a ferromagnetic core makes up the center of the coil, the magnetic field is even greater. Such devices are called electromagnets. Electromagnets have several advantages over permanent magnets. They can develop very intense magnetic fields - much stronger than permanent magnet fields. Also of gr ...
... When a ferromagnetic core makes up the center of the coil, the magnetic field is even greater. Such devices are called electromagnets. Electromagnets have several advantages over permanent magnets. They can develop very intense magnetic fields - much stronger than permanent magnet fields. Also of gr ...
Mantle Materials
... Upper Mantle Olivine • Olivine – Thought to be about 10-12% Fe in upper mantle • At pressures around the 410-km discontinuity, Fo-rich olivine transforms to a ccp structure called wadsleyite. • Iron rich olivines do not undergo this transformation. At higher pressures, both the Fa-rich olivine and ...
... Upper Mantle Olivine • Olivine – Thought to be about 10-12% Fe in upper mantle • At pressures around the 410-km discontinuity, Fo-rich olivine transforms to a ccp structure called wadsleyite. • Iron rich olivines do not undergo this transformation. At higher pressures, both the Fa-rich olivine and ...
The Sun`s magnetic field
... nucleus and thus the actual chemical element itself. But the nucleus is bound by a much stronger force than that keeping electrons attached to an atom, so to break apart this part of the atom requires much greater energy. The force that binds the nucleus operates only over very short distances, and ...
... nucleus and thus the actual chemical element itself. But the nucleus is bound by a much stronger force than that keeping electrons attached to an atom, so to break apart this part of the atom requires much greater energy. The force that binds the nucleus operates only over very short distances, and ...
Magnetism
... ends – poles – called north and south. Like poles repel; unlike poles attract. This attraction or repulsion is the magnetic force. ...
... ends – poles – called north and south. Like poles repel; unlike poles attract. This attraction or repulsion is the magnetic force. ...
15A2-B2. Parasitic Inductive Coupling of Integrated Circuits
... problem formulation. The most appropriate for our needs seems to be the Electromagnetic Circuit Element (EMCE) boundary conditions (b.c.). These boundary conditions allow the compatibility and interconnection of devices having distributed parameters with any external circuit, solving so field-circui ...
... problem formulation. The most appropriate for our needs seems to be the Electromagnetic Circuit Element (EMCE) boundary conditions (b.c.). These boundary conditions allow the compatibility and interconnection of devices having distributed parameters with any external circuit, solving so field-circui ...
Global auroral responses to abrupt solar wind changes: Dynamic
... approximate constant during the event. The impact of this increase in Pdyn on the magnetosphere at 1847 UT shows clearly as an abrupt increase in the low-latitude H-component at all MLT and in the dayside geosynchronous magnetic field observed by the Goes spacecraft. [13] Figure 4 shows the solar wi ...
... approximate constant during the event. The impact of this increase in Pdyn on the magnetosphere at 1847 UT shows clearly as an abrupt increase in the low-latitude H-component at all MLT and in the dayside geosynchronous magnetic field observed by the Goes spacecraft. [13] Figure 4 shows the solar wi ...
Angular momentum evolution
... • Models with a constant coupling timescale between the core and the envelope cannot reproduce the observations • Need for a rotation-dependent core-envelope coupling timescale : weak coupling in slow rotators, strong coupling in fast rotators • Still need to identify the physical origin of this rot ...
... • Models with a constant coupling timescale between the core and the envelope cannot reproduce the observations • Need for a rotation-dependent core-envelope coupling timescale : weak coupling in slow rotators, strong coupling in fast rotators • Still need to identify the physical origin of this rot ...
Magnetic field generation in weak-line T Tauri stars
... the result of a dynamo. Due to the lack of both differential rotation and a radiative core, it must be expected to be quite different from the solar dynamo (Küker & Rüdiger 1997). The most likely process is an 2 -dynamo, which is known to produce non-axisymmetric fields under certain conditions ( ...
... the result of a dynamo. Due to the lack of both differential rotation and a radiative core, it must be expected to be quite different from the solar dynamo (Küker & Rüdiger 1997). The most likely process is an 2 -dynamo, which is known to produce non-axisymmetric fields under certain conditions ( ...
Auroral streamers: characteristics of associated precipitation
... precipitation and its relationship to the field-aligned currents provides a way to test which mechanism (and in which conditions) could be responsible for the precipitation from the fast flow region. As already mentioned, the different types of transient localized auroral forms are observed in assoc ...
... precipitation and its relationship to the field-aligned currents provides a way to test which mechanism (and in which conditions) could be responsible for the precipitation from the fast flow region. As already mentioned, the different types of transient localized auroral forms are observed in assoc ...
Observations of concentrated generator regions in the nightside
... conclude that both the size and the shape of the Cluster tetrahedron are rather optimal during our event. Note that since the curlometer method cannot resolve spatial variations in the current density smaller than the tetrahedron characteristic size, all Cluster data in this article have been smooth ...
... conclude that both the size and the shape of the Cluster tetrahedron are rather optimal during our event. Note that since the curlometer method cannot resolve spatial variations in the current density smaller than the tetrahedron characteristic size, all Cluster data in this article have been smooth ...
Effect of the Magnetic Field on the Solar Wind
... Thus the terms on the R.H.S. are unimportant. The Hall term j x B that produces an additional electric field perpendicular to B, which depends on the different mobility of the charge carriers, can be neglected here, as can the electron pressure gradient. However, these terms become important in labo ...
... Thus the terms on the R.H.S. are unimportant. The Hall term j x B that produces an additional electric field perpendicular to B, which depends on the different mobility of the charge carriers, can be neglected here, as can the electron pressure gradient. However, these terms become important in labo ...
Aurora
An aurora is a natural light display in the sky, predominantly seen in the high latitude (Arctic and Antarctic) regions. Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere), where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying colour and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes. Different aspects of an aurora are elaborated in various sections below.