Results 21 to 30 of about 1,198,926 (208)

Geomagnetic Storms and Related Solar Phenomena (a. Precipitating Particles and Auroras) (Proceedings of the Second Symposium on Coordinated Observations of the Ionosphere and Magnetosphere in the Polar Regions : Part I)

Antarctic Record, 1980
This is an attempt to identify the causes of geomagnetic storms which occurred during a year and a half from January 1977 to June 1978. The assignment of geomagnetic storm causation to appropriate coronal holes or solar flares has been made by ...
Katsuhide MARUHASHI, Takahiroo ISHI
doaj   +1 more source

Coronal Holes and the Solar Wind [PDF]

Highlights of Astronomy, 1992
Around the turn of the century Professor Kristian Birkeland at the University of Kristiania (Oslo) carried out laboratory studies of the emission of charged particles from the Sun and their interaction with comets and magnetized planets. He found that cathode rays emitted by a magnetized sphere are bent toward the equator along trajectories similar to ...
openaire   +1 more source

MHD turbulence and heating of the open field-line solar corona [PDF]

, 2003
This paper discusses the possibility that heating of the solar corona in open field-line regions emanating from coronal holes is due to a nonlinear cascade, driven by low-frequency or quasi-static magnetohydrodynamic fluctuations.
Dmitruk, Pablo, Milano, L., Matthaeus, William H., Dmitruk, P., Milano, L. J., Matthaeus, W. H., Mullan, D. J., Oughton, Sean, S. Oughton, P. Dmitruk, W. H. Matthaeus, L. Milano, Oughton, S., D. J. Mullan   +13 more
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Observational features of equatorial coronal hole jets [PDF]

Annales Geophysicae, 2010
Collimated ejections of plasma called "coronal hole jets" are commonly observed in polar coronal holes. However, such coronal jets are not only a specific features of polar coronal holes but they can also be found in coronal holes appearing at lower ...
G. Nisticò, V. Bothmer, S. Patsourakos, G. Zimbardo   +3 more
doaj   +1 more source

3D reconstruction of coronal loops by the principal component analysis [PDF]

, 2013
Knowing the three dimensional structure of plasma filaments in the uppermost part of the solar atmosphere, known as coronal loops, and especially their length, is an important parameter in the wave-based diagnostics of this part of the Sun.
Nisticò, Giuseppe, Valery Nakariakov, Giuseppe Nisticò, Erwin Verwichte, Valery M. Nakariakov, Verwichte, E. (Erwin), Nakariakov, V. M. (Valery M.)   +6 more
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Empirical Forecast of Corotating Interacting Regions and Geomagnetic Storms Based on Coronal Hole Information [PDF]

Journal of Astronomy and Space Sciences, 2009
In this study, we suggest an empirical forecast of CIR (Corotating Interaction Regions) and geomagnetic storm based on the information of coronal holes (CH). For this we used CH data obtained from He I 10830 Å maps at National Solar Observatory-Kitt Peak
Ji-Hye Lee, Yong-Jae Moon, Yungee Choi, Kye-Hwa Yoo   +3 more
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Effect of structuring on coronal loop oscillations [PDF]

, 2007
In this Thesis the theoretical understanding of oscillations in coronal structures is developed. In particular, coronal loops are modelled as magnetic slabs of plasma.
McEwan, Michael P.
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The solar and interplanetary causes of the recent minimum in geomagnetic activity (MGA23): a combination of midlatitude small coronal holes, low IMF B_Z variances, low solar wind speeds and low solar magnetic fields [PDF]

Annales Geophysicae, 2011
Minima in geomagnetic activity (MGA) at Earth at the ends of SC23 and SC22 have been identified. The two MGAs (called MGA23 and MGA22, respectively) were present in 2009 and 1997, delayed from the sunspot number minima in 2008 and 1996 by ~1/2–1 years.
B. T. Tsurutani, B. T. Tsurutani, E. Echer, W. D. Gonzalez   +3 more
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Solar Wind Forecasting with Coronal Holes [PDF]

Solar Physics, 2006
An empirical model for forecasting solar wind speed related geomagnetic events is presented here. The model is based on the estimated location and size of solar coronal holes. This method differs from models that are based on photospheric magnetograms (e.g., Wang-Sheeley model) to estimate the open field line configuration.
Robbins, S., Henney, C. J., Harvey, J. W.   +2 more
openaire   +2 more sources

Relationship of Coronal Mass Ejection Events with Solar Flares and coronal Holes [PDF]

Symposium - International Astronomical Union, 1990
We present an analysis of the relationship between coronal mass ejection (CME) events with solar flares and coronal holes. Out of 79 CME events whose location and span are known, 10 CME event circles contain solar flares. On the other hand out of 71 CME events (selected for the study with coronal holes) 40 CME event circles contain coronal holes.
openaire   +1 more source