Results 61 to 70 of about 42,046 (150)

New classification parameter of solar flares based on the maximum flux in soft X-rays and on duration of flare

, 2020
Solar flare activity is characterised by different classification systems, both in optical and X-ray ranges. The most generally accepted classifications of solar flares describe important parameters of flares such as the maximum of brightness of the ...
Bruevich, Elena
core  

Properties of Flares-Generated Seismic Waves on the Sun

, 2005
The solar seismic waves excited by solar flares (``sunquakes'') are observed as circular expanding waves on the Sun's surface. The first sunquake was observed for a flare of July 9, 1996, from the Solar and Heliospheric Observatory (SOHO) space mission ...
A. G. Kosovichev, A.-C. Donea, A.-C. Donea, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, A.G. Kosovichev, C.L. Wolff, D.C. Braun, G.H. Fisher, G.J. Hurford, G.J. Hurford, J.J. Podesta, J.J. Podesta, K. Shibata, M. Medrek, M.A. Livshits, N.D. Kostiuk, P.A. Sturrock, P.H. Scherrer, T.E. Abdelatif, T.L. Duvall Jr., Z. Svestka   +23 more
core   +1 more source

Variability of Earth's Magnetopause and Bow Shock Locations Modeled via Multi‐Decade Solar Wind Observations

Geophysical Research Letters, Volume 52, Issue 10, 28 May 2025.
Abstract Numerous studies have explored modeling the shape of Earth's magnetopause (MP) and bow shock (BS) as a function of incident solar wind conditions, utilizing either magnetohydrodynamic model data or observations of boundary crossings from orbiting spacecraft. Here we present a novel method for modeling the variance of the location of the BS and
Kiley L. Yeakel, Ian Cohen, Drew L. Turner   +2 more
wiley   +1 more source

Statistical Studies of Solar White-Light Flares and Comparisons with Superflares on Solar-type Stars

, 2017
Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies ($E$) and durations ($\tau$): $\tau \propto E^{0.39}$ (Maehara et al. 2017 $EP\& S$, 67, 59)
Asai, Ayumi, Honda, Satoshi, Ikuta, Kai, Ishii, Takako, Maehara, Hiroyuki, Namekata, Kosuke, Nogami, Daisaku, Notsu, Shota, Notsu, Yuta, Sakaue, Takahito, Shibata, Kazunari, Watanabe, Kyoko   +11 more
core   +1 more source

The Evolution of Titan's Cold South Polar Cloud

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Early during Titan's southern fall, images captured by Cassini's Imaging Science Subsystem revealed the formation of a large cloud above Titan's south pole. Subsequent analysis of Cassini data revealed the cloud contained HCN ice, but the cloud's evolution has not been examined.
Lavender Elle Hanson, Robert S. French, Darryn W. Waugh, Erika L. Barth, Carrie M. Anderson   +4 more
wiley   +1 more source

Predicting CO Cameron‐Band Auroral Emission at Venus Using VEx Electron Observations

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Various types of auroral emissions have been observed at (partially) magnetized planets (e.g., Earth, Jupiter, and Mars). Auroral emissions have also been observed at Venus, an unmagnetized planet, by the Pioneer Venus Orbiter (PVO) and ground‐based telescopes.
Shaosui Xu, Rudy A. Frahm, Yingjuan Ma, David L. Mitchell, Janet G. Luhmann, Jean‐Claude Gérard, Lauriane Soret, Robert J. Lillis   +7 more
wiley   +1 more source

Konus-Wind and Helicon-Coronas-F Observations of Solar Flares

, 2014
Results of solar flare observations obtained in the Konus-Wind experiment from November, 1994 to December, 2013 and in the Helicon Coronas-F experiment during its operation from 2001 to 2005, are presented.
Aptekar, R. L., Charikov, Yu. E., Frederiks, D. D., Golenetskii, S. V., Kokomov, A. A., Pal'shin, V. D., Sokolova, Z. Ya., Svinkin, D. S., Tsvetkova, A. E., Ulanov, M. V.   +9 more
core   +1 more source

Anticipating Solar Flares

Solar Physics
Abstract Solar flares commonly have a “hot onset precursor event” (HOPE), detectable from soft X-ray observations. To detect this requires subtraction of pre-flare fluxes from the non-flaring Sun prior to the event, fitting an isothermal emission model to the flare excess fluxes by comparing the GOES passbands at 1 – 8 Å and 0.5 – 4 Å, and ...
openaire   +2 more sources

X-ray flares in Orion young stars. I. Flare characteristics

, 2008
Pre-main sequence (PMS) stars are known to produce powerful X-ray flares which resemble magnetic reconnection solar flares scaled by factors up to 10^4.
Drake J. J., Eric D. Feigelson, Giuseppina Micela, Gordon P. Garmire, Hiei E., Isobe H., Jardine M., Konstantin V. Getman, Patrick S. Broos, Reale F., Reale F., Serio S., Siess L., Sylwester B.   +13 more
core   +1 more source

Ionospheric effects of the extreme solar activity of February 1986 [PDF]

During February 1986, near the minimum of the 11 year Solar sunspot cycle, after a long period of totally quiet solar activity (R sub z = 0 on most days in January) a period of a suddenly enhanced solar activity occurred in the minimum between solar ...
Boska, J., Pancheva, D.
core   +1 more source