field changes

field changes

[′fēld ‚chānj·əz]
(meteorology)
With regard to thunderstorm electricity, the rapid variations in the vertical component of the electric field strength at the earth's surface.
References in periodicals archive ?
73, with a 10% contingency added for city engineer-approved field changes.
Global technology and engineering company Emerson's AMS Trex Device Communicator has added new enhancements that improve response time to operational changes through best-in-class visibility of field changes, the company said.
As the sound field changes, so does the shape of the light beam.
amp;nbsp;"And there are widespread implications for such dramatic field changes.
Cook could do little wrong as captain in England's 169-run win in the first Ashes Test, a series of bowling and field changes kept paying off.
These are some of the first observations of how an asteroid's magnetic field changes in time, notes planetary scientist Ben Weiss (MIT), who was not involved in the study.
When Jupiter's magnetic field changes, the aurorae on Ganymede also change, "rocking" back and forth.
Unlike a bar magnet, however, Earth's magnetic field changes over time because it is generated by a geodynamo (in Earth's case, the motion of molten iron alloys in its outer core).
The scientists predicted that, in the next two years, Voyager 1 would cross the current sheet, the sprawling surface within the heliosphere where the polarity of the sun's magnetic field changes from plus to minus and if it would detect a reversal in the magnetic field, it would prove that it was still within the heliosphere.
Field changes and lengthy tactical chats appeared to contribute to the excruciating pace of proceedings, but Saker claimed that surface water from a morning downpour was affecting the state of the ball.
The entrances to the north and south routes are far enough apart that the magnetic fields at each location differ considerably and, because the Earth's magnetic field changes gradually over time, in some years the north entrance is a closer magnetic match to the mouth of the river while, in other years, the south entrance is a better match.
As discussed in [8], the initial field change that ultimately ends-up in a ground flash, is strongly related to the in-cloud discharges termed "cloud-type initial portion of the first leader field change" [12], "pre-preliminary discharge" [13], "long duration preliminary field change" [11], and "large negative pre-stroke field changes" outside the polarity reversal distance [14].