Sentences with phrase «during geomagnetic»

Studies to determine the typical behavior of the electron density peak height disturbance, ΔhmF2, at middle latitudes during geomagnetic storms have been performed (Blanch & Altadill 2012).

Ionospheric behavior during geomagnetic storms, the most fascinating subject in the ionospheric physics, has long been studied.

These gradients become most pronounced during geomagnetic storms.

Auroras appear during geomagnetic storms — that is, when Earth's magnetic field is vibrating in response to a solar wind gust.

The team observed high - energy electrons during a geomagnetic storm of Oct. 9, 2012, which they analyzed together with a data - driven global wave model.

Per Høeg hopes that the work at DTU Space in addition to ensuring better understanding of the phenomenon can help in the development and operation of communications and navigation systems, and account for the conditions during geomagnetic storms so that aircraft and shipping can operate efficiently and safely in the area.

«Our work can help to make navigation safer during geomagnetic storms in the Arctic.

Scientists use models of Earth's structure and measurements of Earth's magnetic field taken at USGS observatories (https://geomag.usgs.gov/monitoring/observatories/) to determine which sections of the electrical grid might lose power during a geomagnetic storm.

On flights over polar regions during geomagnetic events, airplanes can experience radio blackouts and equipment disruptions.

Not exact matches

For example, during the last major geomagnetic storm experienced by Earth in 1989, the entire Canadian province of Quebec went dark when a critical Canadian hydroelectric plant went down.

Measurements of the three - dimensional structure of Earth, as opposed to the one - dimensional models typically used, can help scientists more accurately determine which areas of the United States are most vulnerable to blackouts during hazardous geomagnetic storms.

In addition to brilliant auroral displays, the electric telegraph - the Victorian internet — was found to be disrupted during periods with large geomagnetic storms.

During the last two months, several of these powerful solar flares have been observed, some with associated coronal mass ejections that, in turn, can produce geomagnetic storms that perturb the communication systems in some regions of Earth, especially radio broadcasts and GPS systems.

The records document that the Laschamp Excursion was characterized locally by (1) declination changes of ± 120 °, (2) inclination changes of more than 140 °, (3) ~ 1200 - year oscillations in both inclination and declination, (4) near 90 ° out - of - phase relationships between inclinations and declinations that produced two clockwise loops in directions and virtual geomagnetic poles (VGPs) followed by a counterclockwise loop, (5) excursional VGPs during both intervals of clockwise looping, (6) magnetic field intensities less than 10 % of normal that persisted for almost 2000 years, (7) marked similarity in excursional directions over ~ 5000 km spatial scale length, and (8) secular variation rates comparable to historic field behavior but persisting in sign for hundreds of years.

NASA and United States scientists will join those from Norway, Japan, Canada and other countries during the next two years to investigate the physics of heating and charged particle precipitation in this region called the geomagnetic cusp — one...

This mass of plasma travels at millions of miles per hour and, upon colliding with a planet's magnetic field, can trigger a geomagnetic storm, during which particles trapped in a planet's atmosphere are released.

The spatial extent, the energy, and the amount of radiation in the Van Allen belts are controlled by space weather, with large increases in their size and amount of radiation occurring during large geomagnetic storms.

Geomagnetic storms hit the Arctic, induce strong currents, disturbing the Earth's field and feed back into the oceanic currents, releasing some of the stored heat during the previous cycle (with less geomagneGeomagnetic storms hit the Arctic, induce strong currents, disturbing the Earth's field and feed back into the oceanic currents, releasing some of the stored heat during the previous cycle (with less geomagneticgeomagnetic input):

Geomagnetic storms hit the Arctic, induce strong currents, disturbing the Earth's field and feed back into the oceanic currents, releasing some of the stored heat during the previous cycle (with less geomagnetic input): http://www.vukcevic.talktalk.Geomagnetic storms hit the Arctic, induce strong currents, disturbing the Earth's field and feed back into the oceanic currents, releasing some of the stored heat during the previous cycle (with less geomagnetic input): http://www.vukcevic.talktalk.geomagnetic input): http://www.vukcevic.talktalk.net/Spc.htm

«The solar and volcanic forcings we use are derived from reconstructions based on proxy data and are therefore also subject to considerable uncertainties, although recent explosive volcanic eruptions are likely to have cooled climate, and independent records of solar activity levels inferred from the cosmogenic isotope 10Be (43) and geomagnetic records (44) provide support to reconstructions (22, 45) that show generally increasing solar activity during the 20th century (12).»

It is evident that the lowest geomagnetic activity has been observed in 2009, and a well - pronounced semiannual variation of geomagnetic activity of the solar cycle 22/23 minimum was not present during the minimum of 23/24.

Recurrent geomagnetic storms, produced by coronal holes, overcome the effect of solar irradiance on the ionosphere during declining and minimum phases of solar activity.

On this line, special interest is paid to ionospheric response (ionospheric storms) during the unusually prolonged solar minimum (2006 — 2009), when the EUV solar irradiance and CME occurrence were very low, but nevertheless moderate and weaker geomagnetic storms frequently took place.

CME events are usually the origin of intense geomagnetic storm and they occur predominantly during solar maximum phase.

SWIF's performance was evaluated during disturbed conditions against standard models (e.g., climatology and persistence) and other forecasting models of different philosophy such as the TSAR that is a purely autoregressive technique and the Geomagnetically Correlated Autoregression Model — GCAM (Muhtarov et al. 2002) that is driven by the geomagnetic activity level by incorporating the cross-correlation between the foF2 and the Ap - index into the auto - correlation analysis (Tsagouri et al. 2009).

In conclusion, it has to be noted that the ionospheric response to recurrent geomagnetic activity is really due to the same physical processes that disturb the ionosphere during classical ionospheric storms which are typically isolated events.

Coronal holes emit high - speed solar wind (HSS), capable to produce a series of moderate and weaker geomagnetic storms which continuously (recurrently) appear during periods longer than one solar rotation.

We observed changes in foF2 up to 60 % during these events, which at middle latitudes are typical rather for strong geomagnetic storms than for minor and moderate disturbances.

TEC is more robust parameter than foF2, because it is available even during severe geomagnetic storms, when foF2 is frequently missing.

Section 1 contains five subsections with results on 27 - day response of low - latitude ionosphere to solar extreme - ultraviolet (EUV) radiation, response to the recurrent geomagnetic storms, long - term trends in the upper atmosphere, latitudinal dependence of total electron content on EUV changes, and statistical analysis of ionospheric behavior during prolonged period of solar activity.

Solar wind disturbances driven by fast coronal mass ejections are now thought to produce the most intense geomagnetic storms, at least during the maximum in the Sun's activity cycle.

A joint analysis of paleodata on variations in cosmic ray fluxes, solar activity, geomagnetic field, and climate during the period from ∼ 10000 to ∼ 100000 years ago has been performed.

The records document that the Laschamp Excursion was characterized locally by (1) declination changes of ± 120 °, (2) inclination changes of more than 140 °, (3) ~ 1200 - year oscillations in both inclination and declination, (4) near 90 ° out - of - phase relationships between inclinations and declinations that produced two clockwise loops in directions and virtual geomagnetic poles (VGPs) followed by a counterclockwise loop, (5) excursional VGPs during both intervals of clockwise looping, (6) magnetic field intensities less than 10 % of normal that persisted for almost 2000 years, (7) marked similarity in excursional directions over ~ 5000 km spatial scale length, and (8) secular variation rates comparable to historic field behavior but persisting in sign for hundreds of years.