نتایج جستجو برای: sun cmes
تعداد نتایج: 35082 فیلتر نتایج به سال:
Manned spacecraft will require a much improved ability to forecast solar particle events. The lead time required will depend on the use to which the forecast is put. Here we discuss problems of forecasting with the lead times of hours to weeks. Such forecasts are needed for scheduling and carrying out activities. Our present capabilities with these lead times is extremely limited. To improve ou...
Coronal mass ejections (CMEs) are large scale eruptions observed close to the Sun. They travelling through heliosphere and possibly interacting with Earth environment creating interruptions or even damaging new technology instruments. Most of time their physical conditions (velocity, density, pressure) only measured in situ at one point space, no possibility have information on variation these ...
Solar coronal mass ejections (CMEs) are associated with many dynamical phenomena, among which EIT waves have always been a puzzle. In this Letter MHD processes of CME-induced wave phenomena are numerically simulated. It is shown that as the flux rope rises, a piston-driven shock is formed along the envelope of the expanding CME, which sweeps the solar surface as it propagates. We propose that t...
We examined interplanetary magnetic field disturbances recorded at the NEARShoemaker spacecraft when it was above either the east or west solar limb as seen from Earth, and then we identified the associated coronal mass ejections (CMEs) detected above the limbs by the SOHO/LASCO coronagraph. We found 10 cases where a nonrecurring IP disturbance could be associated with a CME. Eight of the distu...
Coronal Mass Ejections (CMEs) are large-scale eruptions from the Sun into interplanetary space. Despite being major space weather drivers, our knowledge of CME properties in inner heliosphere remains constrained by scarcity observations at distances other than 1 au. Furthermore, most CMEs observed situ single spacecraft, requiring numerical models to complement sparse available. We aim assess a...
Stealth coronal mass ejections (CMEs) are eruptions from the Sun that not associated with appreciable low-coronal signatures. Because they often cannot be linked to a well-defined source region on Sun, analysis of their initial magnetic configuration and eruption dynamics is particularly problematic. In this article, we address issue by undertaking first attempt at predicting fields stealth CME...
We compare listings of coronal mass ejections (CMEs) observed by LASCO on SOHO and solar microwave bursts (SMBs) recorded by the USAF Radio Solar Telescope Network (RSTN). These data sets are the product of stable and continuous observations of the whole Sun, and provide suitable bases for robust statistical studies. In total, 3557 coronal ejections, and nearly 1051 bursts above 50 sfu were obs...
Coronal mass ejections (CMEs) are large clouds of magnetized plasma ejected from the Sun, and often associated with acceleration electrons that can result in radio emission via various mechanisms. However, underlying mechanism relating CMEs particle still remains a subject heated debate. Here, we report multi-instrument extreme ultraviolet (EUV) imaging solar eruption event on 24 September 2011...
We present an advance toward accurately predicting the arrivals of coronal mass ejections (CMEs) at the terrestrial planets, including Earth. For the first time, we are able to assess a CME prediction model using data over two thirds of a solar cycle of observations with the Heliophysics System Observatory. We validate modeling results of 1337 CMEs observed with the Solar Terrestrial Relations ...
The coronal mass ejections (CMEs) from the Sun are known for their space weather and geomagnetic consequences. Among all CMEs, so-called radio-loud (RL) halo CMEs considered most energetic in sense that they usually faster wider than general population of CMEs. Hence study RL has become important prediction occurrence rate a future cycle will give warning advance. In present paper, rates solar ...
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