Results 31 to 40 of about 1,198,926 (208)

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

Propagation and damping of MHD waves in the solar atmosphere [PDF]

, 2015
Quasi-periodic disturbances have been observed in the outer solar atmosphere for many years. Although first interpreted as upflows (Schrijver et al.
Kiddie, Greg
core   +2 more sources

Geomagnetic storms forecasting from solar coronal holes

Monthly Notices of the Royal Astronomical Society, 2022
<p>Coronal holes (CHs) are the source of high-speed solar wind streams (HSSs), which interact with the slow solar wind and form corotating interaction regions (CIRs) in the heliosphere. These high-speed streams and their associated structures influence the geomagnetic activity, causing recurrent geomagnetic storms. The propagation time of
Simona Nitti, Tatiana Podladchikova, Astrid M. M. Veronig, Stefan Hofmeister, Giuliana Verbanac, Mario Bandić   +5 more
openaire   +3 more sources

Statistics of counter-streaming solar wind suprathermal electrons at solar minimum : STEREO observations [PDF]

, 2010
Previous work has shown that solar wind suprathermal electrons can display a number of features in terms of their anisotropy. Of importance is the occurrence of counter-streaming electron patterns, i.e., with "beams" both parallel and anti-parallel to ...
Skoug, R. M., C. Mazelle, A. Opitz, Luhmann, J.G., E. Penou, Penou, E., C. Jacquey, Génot, Vincent, Larson, D. E., Jian, L., Sauvaud, J.-A., Fedorov, A., Jacquey, C.J., P. Schroeder, Gosling, J.T., Skoug, R.M., R. M. Skoug, Jacquey, C., K. D. Simunac, Meziane, K., Russell, C. T., Lavraud, B., C. Foullon, Foullon, C., J.-A. Sauvaud, Sauvaud, Jean-André, Rouillard, A.P., I. Dandouras, Rouillard, A. P., Génot, V., Luhmann, J. G., J. T. Gosling, C. T. Russell, J. T. Steinberg, Foullon, C. (Claire), A. B. Galvin, Opitz, A., Simunac, K. D., Larson, D.E., K. Meziane, Mazelle, C., Foullon, Claire, A. Fedorov, Galvin, A. B., J. G. Luhmann, Sauvaud, J.A., P. Louarn, Russell, C. T. (Christopher T.), Steinberg, John Tyree, D. E. Larson, Dandouras, I., Steinberg, J. T., Simunac, K.D.C., A. P. Rouillard, Schroeder, P., Russell, C.T., Galvin, A.B., Steinberg, J.T., Gosling, J. T., L. Jian, Louarn, P., V. Génot, B. Lavraud   +62 more
core   +2 more sources

Heating solar coronal holes

The Astrophysical Journal, 1991
It has been shown that the coronal hole, and the associated high-speed stream in the solar wind, are powered by a heat input of the order of 500,000 ergs/sq cm s, with most of the heat injected in the first 1-2 solar radii, and perhaps 100,000 ergs/sq cm s introduced at distances of several solar radii to provide the high speed of the issuing solar ...
openaire   +1 more source

The Fine-scale Structure of Polar Coronal Holes

The Astrophysical Journal, 2023
Coronal holes are thought to be composed of relatively broad columnar structures known as plumes. Here, we demonstrate that the plumes (and interplumes) in polar coronal holes are composed of fine-scale filamentary structure, with average scales of 2″–10″
R. J. Morton, R. Cunningham
doaj   +1 more source

From Coronal Holes to Pulsars and Back Again: Learning the Importance of Data

Frontiers in Astronomy and Space Sciences, 2022
Although wanting to become an astronomer from an early age, I ended up in solar physics purely by chance, after first working in high-energy astrophysics.
Y.-M. Wang
doaj   +1 more source

Cosmic Ray Anisotropy Generated by the June 22nd 2015 Interplanetary Events

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract On 22 June 2015, the near Earth interplanetary space was perturbed by a series of high‐speed streamers and interplanetary coronal mass ejections associated with an active region and two low‐latitude coronal holes. The interaction of these disturbances gave rise to the complex solar wind structure observed at 1 au.
A. Lara, K. P. Arunbabu, T. Niembro
wiley   +1 more source

Magnetic Topology and Loop Statistics in Observed Coronal Holes Using Potential Field Modeling

The Astrophysical Journal
Potential field source surface (PFSS) models are widely used to study the solar corona and form the basis for solar wind forecasting, yet they often fail to reproduce observed properties of coronal holes.
Stephan G. Heinemann, Jens Pomoell, Manuela Temmer   +2 more
doaj   +1 more source

Relation between the area of polar coronal holes and the solar wind speed at a minimum between solar cycles 22 and 23

Solar-Terrestrial Physics, 2023
We have used data from the space telescope SOHO/EIT and the spectrometer VEIS on the Wind spacecraft to compare the solar wind (SW) speed near Earth's orbit with changes in the area of polar coronal holes (CHs) on the Sun during the 1996 solar activity ...
Borisenko A. V., Bogachev S. A.
doaj   +1 more source