Zobrazeno 1 - 10
of 2 643
pro vyhledávání: '"polar-cap"'
Publikováno v:
Solar-Terrestrial Physics, Vol 10, Iss 3, Pp 108-120 (2024)
An elliptical model of cutoff for solar cosmic rays (SCR) at high latitudes has been calculated for SCR events and geomagnetic storms that occurred in February, March, and September 2014, June 2015, and September 2017 in order to predict the polar ca
Externí odkaz:
https://doaj.org/article/51ef2dfeb2e54f678f9caed905227379
Autor:
Seong-Joong Kim, Hyesun Choi
Publikováno v:
Polar Research, Vol 43, Pp 1-18 (2024)
The stratospheric polar vortex (SPV) weakening is linked to surface circulation changes. This study employs statistical analysis using reanalysis data to compare the anomalous SPV behaviour in the Northern (NH) and Southern (SH) hemispheres and its d
Externí odkaz:
https://doaj.org/article/035f9201a854441ebc3f7e04880874da
Autor:
David R. Themens, Sean Elvidge, Anthony McCaffrey, P. T. Jayachandran, Anthea Coster, Roger H. Varney, Ivan Galkin, Lindsay V. Goodwin, Chris Watson, Sophie Maguire, Andrew J. Kavanagh, Shun‐Rong Zhang, Larisa Goncharenko, Asti Bhatt, Gareth Dorrian, Keith Groves, Alan G. Wood, Ben Reid
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 19, Pp n/a-n/a (2024)
Abstract The high latitude ionospheric evolution of the May 10‐11, 2024, geomagnetic storm is investigated in terms of Total Electron Content and contextualized with Incoherent Scatter Radar and ionosonde observations. Substantial plasma lifting is
Externí odkaz:
https://doaj.org/article/b7999dc706664024b009b1db8b7f9106
Publikováno v:
Frontiers in Environmental Science, Vol 12 (2024)
The aurora arc is a separate auroral structure from the aurora oval, whose location and morphology are related to various solar-terrestrial circumstances. However, because of the low occurring frequency of aurora arc and the lack of the automatic ide
Externí odkaz:
https://doaj.org/article/cb0e4791207644c49604c3cbae88e528
Autor:
Takanori Nishiyama, Masato Kagitani, Senri Furutachi, Yuki Iwasa, Yasunobu Ogawa, Takuo T. Tsuda, Peter Dalin, Fuminori Tsuchiya, Satonori Nozawa, Fred Sigernes
Publikováno v:
Earth, Planets and Space, Vol 76, Iss 1, Pp 1-9 (2024)
Abstract This study presents a first simultaneous observation of $$\mathrm {N_{2}^{+}}$$ N 2 + Meinel (0,0) band (hereafter, $$\mathrm {N_{2}^{+}}$$ N 2 + (M)) aurora by cutting-edge short-wavelength infrared imaging spectrograph (NIRAS-2) and monoch
Externí odkaz:
https://doaj.org/article/2dd7d8c20b0d4324893da652d3f506fb
Autor:
Mauro Regi, Alessandro Piscini, Patrizia Francia, Marcello De Lauretis, Gianluca Redaelli, Giuseppina Carnevale
Publikováno v:
Remote Sensing, Vol 16, Iss 17, p 3318 (2024)
On 4 November 2021, during the rising phase of solar cycle 25, an intense geomagnetic storm (Kp = 8−) occurred. The effects of this storm on the outer magnetospheric region up to the ionospheric heights have already been examined in previous invest
Externí odkaz:
https://doaj.org/article/40ed2c4765f34ad0add22af7dfc2c3f8
Autor:
Lisa Baddeley, Dag Lorentzen, Stein Haaland, Erkka Heino, Ingrid Mann, Wojciech Miloch, Kjellmar Oksavik, Noora Partamies, Andres Spicher, Juha Vierinen
Publikováno v:
Progress in Earth and Planetary Science, Vol 10, Iss 1, Pp 1-24 (2023)
Abstract Incoherent scatter radars (ISRs) represent the only instrument (both ground and space based) capable of making high temporal and spatial resolution measurements of multiple atmospheric parameters—such as densities, temperatures, particle v
Externí odkaz:
https://doaj.org/article/d6034c1ba83c47129c8df33e3767470d
Publikováno v:
Earth and Planetary Physics, Vol 7, Iss 4, Pp 513-519 (2023)
Cusp spot, High Latitude Dayside aurora (HiLDA), ‘space hurricane’, and 15MLT-PCA (Polar Cap Arc observed around 15:00 Magnetic Local Time) are mesoscale auroral structures observed in the polar cap region. They share many common properties and,
Externí odkaz:
https://doaj.org/article/a8d955982df64bbb8b7cfc3e64a8f017
Publikováno v:
地球与行星物理论评, Vol 54, Iss 4, Pp 398-416 (2023)
The polar cap patch is a common ionospheric structure. It often appears in the F region of the ionosphere over the polar caps; these patches are usually characterized by electron densities that can be even twice greater than that of the surrounding a
Externí odkaz:
https://doaj.org/article/cce1567ef64440b8a0e7698db7efb200
Autor:
Larry R. Lyons, Yukitoshi Nishimura, Jiang Liu, Sneha Yadav, Ying Zou, William A. Bristow, Eric Donovan, Nozomu Nishitani
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2024)
Flow channels can extend across the polar cap from the dayside to the nightside auroral oval, where they lead to localized reconnection and auroral oval disturbances. Such flow channels can persist within the polar cap >1½ hours, can move azimuthall
Externí odkaz:
https://doaj.org/article/610649d188da479bb20d1a3d089f0b34