surges


Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms.

surges

Impulsive events on the Sun that are characterized by the ejection of chromospheric material into the inner corona with velocities of 100–200 km s–1. They occur in active regions, where they often accompany flares but more generally stem from small flarelike brightenings (termed moustaches or Ellerman bombs) at the outer edge of the penumbra of sunspots. The surge material, which is usually directed radially away from the spot, may reach a height of a couple of hundred thousand kilometers before fading or returning to the chromosphere along either a curved trajectory or, more frequently, the trajectory of its ascent. Surges typically have a lifetime of 10–20 minutes and show a strong tendency to recur. See also prominences.
References in classic literature ?
I did not see what went on elsewhere, though I felt the sudden surge and heel of the schooner as the wind-pressures changed to the jibing of the fore- and main-sails.
I caught sight of him toiling at the main-sheet, heaving it in and flat with his tremendous muscles, the stern of the schooner lifted high in the air and his body outlined against a white surge of sea sweeping past.
It seemed incredible that the next surge should not crush the Ghost down upon the tiny eggshell.
The sea was less boisterous, since the wind came off land--a fortunate circumstance for the boat, which would suffer, owing to its small tonnage, by a heavy surge on the sea.
Weakly I rose for the last time--my tortured lungs gasped for the breath that would fill them with a strange and numbing element, but instead I felt the revivifying breath of life-giving air surge through my starving nostrils into my dying lungs.
Hydro One communications officer Nancy Shaddick said that victims of Hydro One power surges can contact the company at 1-888-664-9376 and request a form to fill out to submit to the company's insurer: Quelmec Loss Adjustors.
The CDN 3083-S 100M injects standard 1.2/50-[mu]s combination wave surges up to 8-kV open-circuit and up to 4kA 8/20-[mu]s surge short circuit into an EUT's main power supply.
Computer simulation investigations of HV windings of HV power transformers for its behavior with [alpha] values 6, 12 and 18 to appearance of very fast rise voltage surges at line terminal have indicated that:
Lieberman's proposed strategy is based on what he calls six "surges":
For slow front surges of a 30/60 [micro]s wave shape, the IEEE model displays a greater accuracy degree than the simplified model for all cases.
The Category 3 storm whipped up water levels, generating storm surges that swept over seawalls and flooded seaside and inland communities.
It has already been mentioned that by installing only one surge arrester (SA-1) for cable lengths below 29 km, the overvotlage surges at the cable end are higher in magnitude than BIL ratings of the feeder equipment.