Results 21 to 30 of about 1,261,581 (220)

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
core   +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

On the topology of global coronal magnetic fields [PDF]

, 2014
This thesis considers the magnetic topology of the global solar corona. To understand the magnetic topology we use the magnetic skeleton which provides us with a robust description of the magnetic field.
Edwards, Sarah J.
core   +2 more sources

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

MHD simulations of coronal heating [PDF]

, 2015
The problem of heating the solar corona requires the conversion of magnetic energy into thermal energy. Presently, there are two promising mechanisms for heating the solar corona: wave heating and nanoflare heating.
Tam, Kuan V.
core   +2 more sources

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
doaj   +1 more source

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
doaj   +1 more source

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

Study of the solar coronal hole rotation

Advances in Space Research, 2018
Abstract Rotation of coronal holes is studied using data from SDO/AIA for 2014 and 2015. A new approach to the treatment of data is applied. Instead of calculated average angular velocities of each coronal hole centroid and then grouping them in latitudinal bins for calculating average rotation rates of corresponding latitudes, we compiled instant ...
N.B. Oghrapishvili, S.R. Bagashvili, D.A. Maghradze, T.Z. Gachechiladze, D.R. Japaridze, B.M. Shergelashvili, T.G. Mdzinarishvili, B.B. Chargeishvili   +7 more
openaire   +2 more sources