ESS 7 Lecture 14 October 31, 2008 Magnetic Storms
... • The ring current decreases the horizontal component of the magnetic field at the Earth’s surface. (You can use a right hand rule to check this – Place your thumb along the direction of the current. Your bent figures will give the direction of the change in the magnetic field.) ...
... • The ring current decreases the horizontal component of the magnetic field at the Earth’s surface. (You can use a right hand rule to check this – Place your thumb along the direction of the current. Your bent figures will give the direction of the change in the magnetic field.) ...
AVIATION User Requirement Timeliness Customer Rationale
... 1. Discontinue maintenance work and restore out of service high voltage transmission lines. Avoid taking long lines out of service. 2. Maintain system voltages within acceptable operating range to protect ...
... 1. Discontinue maintenance work and restore out of service high voltage transmission lines. Avoid taking long lines out of service. 2. Maintain system voltages within acceptable operating range to protect ...
Earth`s magnetic field – what is it good for?
... as they collide with the particles of the very low density interstellar medium. The region where they finally run out of energy to push back the interstellar medium is called the heliopause and this is accepted as the outer edge of the Solar System. As well as the solar wind, the Sun also emits occa ...
... as they collide with the particles of the very low density interstellar medium. The region where they finally run out of energy to push back the interstellar medium is called the heliopause and this is accepted as the outer edge of the Solar System. As well as the solar wind, the Sun also emits occa ...
Assignment 4
... 1. How does the solar cycle (one manifestation is the sunspot cycle) relate to geomagnetic storms? ...
... 1. How does the solar cycle (one manifestation is the sunspot cycle) relate to geomagnetic storms? ...
Geomagnetic storm
A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by a solar wind shock wave and/or cloud of magnetic field that interacts with the Earth's magnetic field. The increase in the solar wind pressure initially compresses the magnetosphere. The solar wind's magnetic field interacts with the Earth’s magnetic field and transfers an increased energy into the magnetosphere. Both interactions cause an increase in plasma movement through the magnetosphere (driven by increased electric fields inside the magnetosphere) and an increase in electric current in the magnetosphere and ionosphere.During the main phase of a geomagnetic storm, electric current in the magnetosphere creates a magnetic force that pushes out the boundary between the magnetosphere and the solar wind. The disturbance in the interplanetary medium that drives the storm may be due to a solar coronal mass ejection (CME) or a high speed stream (co-rotating interaction region or CIR) of the solar wind originating from a region of weak magnetic field on the Sun’s surface. The frequency of geomagnetic storms increases and decreases with the sunspot cycle. CME driven storms are more common during the maximum of the solar cycle, while CIR driven storms are more common during the minimum of the solar cycle.Several space weather phenomena tend to be associated with or are caused by a geomagnetic storm. These include: solar energetic Particle (SEP) events, geomagnetically induced currents (GIC), ionospheric disturbances that cause radio and radar scintillation, disruption of navigation by magnetic compass and auroral displays at much lower latitudes than normal. In 1989, a geomagnetic storm energized ground induced currents that disrupted electric power distribution throughout most of the province of Quebec and caused aurorae as far south as Texas.