Results 11 to 20 of about 1,185,541 (288)

Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A [PDF]

The Astrophysical Journal
We have detected solar-like oscillations in the mid-K-dwarf ϵ Indi A, making it the coolest dwarf to have measured oscillations. The star is noteworthy for harboring a pair of brown dwarf companions and a Jupiter-type planet.
Mia S. Lundkvist, Hans Kjeldsen, Timothy R. Bedding, Mark J. McCaughrean, R. Paul Butler, Ditte Slumstrup, Tiago L. Campante, Conny Aerts, Torben Arentoft, Hans Bruntt, Cátia V. Cardoso, Fabien Carrier, Laird M. Close, João Gomes da Silva, Thomas Kallinger, Robert R. King, Yaguang Li, Simon J. Murphy, Jakob L. Rørsted, Dennis Stello   +19 more
doaj   +2 more sources

Evolution and characteristics of global pc5 ULF waves during a high solar wind speed interval [PDF]

, 2005
We present an interval of extremely long-lasting narrow-band Pc5 pulsations during the recovery phase of a large geomagnetic storm. These pulsations occurred continuously for many hours and were observed throughout the magnetosphere and in the dusk ...
Mann, I. R., Rème, H., Donovan, E. F., Fenrich, F. R., Balogh, A., Singer, H. J., Rae, I. J., Lester, M., Watt, C. E. J., Lavraud, B., Milling, D. K., Wild, James A.   +11 more
core   +4 more sources

Evidence of Transverse Magnetospheric Field Line Oscillations as Observed from Cluster and Ground Magnetometers [PDF]

, 2005
The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119 000 km, perigee of 19 000 km and the orbital period of 57 h) have been prepared in the frequency range 0 to 120 mHz
A. Balogh (7591361), A. K. Sinha, S. W. H. Cowley, Balogh, A., Wild, J. A., Timothy Kenneth Yeoman (7635005), Wright, D. M., J. A. Wild, A. Balogh, J. A. Wild (7591442), T. K. Yeoman, Cowley, S. W. H., D. M. Wright (7583069), D. M. Wright, Stanley William Herbert Cowley (7627505), A. K. Sinha (1768696), Sinha, A. K., Yeoman, T. K.   +17 more
core   +6 more sources

Coordinated ground-based and Cluster observations of large amplitude global magnetospheric oscillations during a fast solar wind speed interval [PDF]

, 2002
We present magnetospheric observations of very large amplitude global scale ULF waves, from 9 and 10 December 2000 when the upstream solar wind speed exceeded 600 km/s.
Viljanen, A., Mann, I. R., Kauristie, K., Voronkov, I., Balogh, A., Bale, S. D., Dunlop, M., Wild, J., Donovan, E., Yeoman, T. K., Amm, O., Milling, D. K., Opgenoorth, H. J.   +12 more
core   +6 more sources

Polarisation of decayless kink oscillations of solar coronal loops

Nature Communications, 2023
Decayless kink oscillations of plasma loops in the solar corona may contain an answer to the enigmatic problem of solar and stellar coronal heating. The polarisation of the oscillations gives us a unique information about their excitation mechanisms and ...
Sihui Zhong, Valery M. Nakariakov, Dmitrii Y. Kolotkov, Lakshmi Pradeep Chitta, Patrick Antolin, Cis Verbeeck, David Berghmans   +6 more
doaj   +1 more source

Low-frequency oscillations while magnetic storms as a tool to determine the types of solar plasma flows [PDF]

E3S Web of Conferences, 2020
Comparison of wavelet spectrum (skeletons) local maxima for disturbed components of solar plasma flow parameters and geomagnetic field disturbances recorded along the meridional station chain during geomagnetic storm intervals is performed in the range ...
Barkhatov N. A., Revunov S.E., Cherney O. T., Smirnova Zh. V., Mukhina M. V.   +4 more
doaj   +1 more source

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.
core   +2 more sources

Transverse Vertical Oscillations During the Contraction and Expansion of Coronal Loops

The Astrophysical Journal, 2023
In this paper, we carry out a detailed analysis of the M1.6 class eruptive flare occurring in NOAA active region 13078 on 2022 August 19. The flare is associated with a fast coronal mass ejection (CME) propagating in the southwest direction with an ...
Qingmin Zhang, Yuhao Zhou, Chuan Li, Qiao Li, Fanxiaoyu Xia, Ye Qiu, Jun Dai, Yanjie Zhang   +7 more
doaj   +1 more source

Solar Activity and Solar Oscillations [PDF]

Symposium - International Astronomical Union, 1997
Helioseismology provides us with the tools to probe solar activity. So that we can consider how the solar oscillations are influenced by that activity, we first consider the phenomena that we associate with the active Sun. The surface of the Sun is not quiet but shows evidence of convection on a wide range of scales from a few hundred kilometres ...
openaire   +1 more source

Intermediate Degree Solar Oscillations [PDF]

Symposium - International Astronomical Union, 1988
Spectra of solar intensity oscillations in the degree range ℓ = 20–98 were obtained with a 92% duty cycle over a 50 hour period from the geographic South Pole. After correction for solar rotation, the spectra have been averaged over azimuthal order m and fit with Lorentzian functions to provide values of background noise, amplitude, frequency and line ...
T. L. Duvall, J. W. Harvey, M. A. Pomerantz   +2 more
openaire   +1 more source