Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Ballester, Jose Luis"'
Publikováno v:
Philosophical Transactions of the Royal Society A, Volume 382, Issue 2272, 2024
Partially ionised plasmas (PIP) constitute an essential ingredient of our plasma universe. Historically, the physical effects associated with partial ionisation were considered in astrophysical topics such as the interstellar medium, molecular clouds
Externí odkaz:
http://arxiv.org/abs/2405.12627
Publikováno v:
A&A 650, A45 (2021)
There is observational evidence of the presence of small-amplitude transverse magnetohydrodynamic (MHD) waves with a wide range of frequencies in the threads of solar prominences. It is believed that the waves are driven at the photosphere and propag
Externí odkaz:
http://arxiv.org/abs/2103.16599
In the solar atmosphere, Alfv\'en waves are believed to play an important role in the transfer of energy from the photosphere to the corona and solar wind, and in the heating of the chromosphere. We perform numerical computations to investigate energ
Externí odkaz:
http://arxiv.org/abs/1812.01323
Autor:
Luna, Manuel, Karpen, Judith, Ballester, José Luís, Muglach, Karin, Terradas, Jaume, Kucera, Therese, Gilbert, Holly
We have catalogued 196 filament oscillations from the GONG $H{\alpha}$ network data during several months near the maximum of solar cycle 24 (January - June 2014). Selected examples from the catalog are described in detail, along with our statistical
Externí odkaz:
http://arxiv.org/abs/1804.03743
Autor:
Gurgenashvili, Eka, Zaqarashvili, Teimuraz V., Kukhianidze, Vasil, Oliver, Ramon, Ballester, Jose Luis, Dikpati, Mausumi, McIntosh, Scott W.
Rieger-type periodicity has been detected in different activity indices over many solar cycles. It was recently shown that the periodicity correlates with solar activity having a shorter period during stronger cycles. Solar activity level is generall
Externí odkaz:
http://arxiv.org/abs/1707.08615
Autor:
Ballester, Jose Luis, Alexeev, Igor, Collados, Manuel, Downes, Turlough, Pfaff, Robert F., Gilbert, Holly, Khodachenko, Maxim, Khomenko, Elena, Shaikhislamov, Ildar F., Soler, Roberto, Vazquez-Semadeni, Enrique, Zaqarashvili, Teimuraz
Partially ionized plasmas are found across the Universe in many different astrophysical environments. They constitute an essential ingredient of the solar atmosphere, molecular clouds, planetary ionospheres and protoplanetary disks, among other envir
Externí odkaz:
http://arxiv.org/abs/1707.07975
Publikováno v:
A&A 592, A28 (2016)
Observations have shown that magnetohydrodynamic waves over a large frequency range are ubiquitous in solar prominences. The waves are probably driven by photospheric motions and may transport energy up to prominences suspended in the corona. Dissipa
Externí odkaz:
http://arxiv.org/abs/1605.07048
Autor:
Gurgenashvili, Eka, Zaqarashvili, Teimuraz, Kukhianidze, Vasil, Oliver, Ramon, Ballester, Jose Luis, Ramishvili, Giorgi, Shergelashvili, Bidzina, Hanslmeier, Arnold, Poedts, Stefaan
Solar activity undergoes a variation over time scales of several months known as Rieger-type periodicity, which usually occurs near maxima of sunspot cycles. An early analysis showed that the periodicity appears only in some cycles, and is absent in
Externí odkaz:
http://arxiv.org/abs/1605.04162
Dissipation of magnetohydrodynamic (MHD) wave energy has been proposed as a viable heating mechanism in the solar chromospheric plasma. Here, we use a simplified one-dimensional model of the chromosphere to theoretically investigate the physical proc
Externí odkaz:
http://arxiv.org/abs/1508.01497
Context. Prominence oscillations have been mostly detected using Doppler velocity, although there are also claimed detections by means of periodic variations in half-width or line intensity. However, scarce observational evidence exists about simulta
Externí odkaz:
http://arxiv.org/abs/1401.2131