On the relation between ionospheric parameters and sunspot number

Autor: Chris Hall, Magnar Gullikstad Johnsen, Ashley Smyth

Publikováno v: Experimental Results, Vol 1 (2020)

In a recent study, mid-latitude ionospheric parameters were compared with solar activity; it was suggested that the relationship between these, earlier assumed stable, might be changing with time (Lastovicka, 2019). Here, the information is extended

Externí odkaz: https://doaj.org/article/434f531347974e16b78e6057cf5fdabb

A night-side shock aurora and its three different emissions observed on 26 February 2023

Autor: Sota Nanjo, Masatoshi Yamauchi, Magnar Gullikstad Johnsen, Yoshihiro Yokoyama, Urban Brändström, Keisuke Hosokawa

Ground-based observations of shock aurora, which is an aurora related to geomagnetic sudden commencement (SC), have mainly been limited to the dayside. On 26 February 2023, right after the SC onset at 19:24 UT, ground-based all-sky cameras and a wide

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ceaa77c75c6dc477e5629cf912f6e9a5
https://doi.org/10.22541/essoar.167979139.99692462/v1

High-latitude crochet: solar-flare-induced magnetic disturbance independent from low-latitude crochet

Autor: Masatoshi Yamauchi, Anders Tjulin, Anna Willer, Magnar Gullikstad Johnsen, D. A. Sormakov, Carl-Fredrik Enell

Publikováno v: Annales Geophysicae, Vol 38, Pp 1159-1170 (2020)
Yamauchi, M, Johnsen, M G, Enell, C F, Tjulin, A, Willer, A & Sormakov, D A 2020, ' High-latitude crochet : Solar-flare-induced magnetic disturbance independent from low-latitude crochet ', Annales Geophysicae, vol. 38, no. 6, pp. 1159-1170 . https://doi.org/10.5194/angeo-38-1159-2020

A solar-flare-induced, high-latitude (peak at 70–75∘ geographic latitude – GGlat) ionospheric current system was studied. Right after the X9.3 flare on 6 September 2017, magnetic stations at 68–77∘ GGlat near local noon detected northward

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c111bb73a37939e6f9505f6c17baf1db
https://angeo.copernicus.org/articles/38/1159/2020/angeo-38-1159-2020.pdf

An automated auroral detection system using deep learning: real-time operation in Tromsø, Norway

Autor: Satonori Nozawa, Keisuke Hosokawa, Sota Nanjo, Tetsuya Kawabata, Masaki Yamamoto, Magnar Gullikstad Johnsen, Takuo T. Tsuda

Publikováno v: Scientific reports. 12(1)

The activity of citizen scientists who capture images of aurora borealis using digital cameras has recently been contributing to research regarding space physics by professional scientists. Auroral images captured using digital cameras not only fasci

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::180402d8c74dd9ef4adb093fe79df47c
https://pubmed.ncbi.nlm.nih.gov/35641512

How To Manage Geomagnetic-Field Disturbances in the Northern Auroral Zone To Improve the Accuracy of Magnetic Measurement-While-Drilling Directional Surveys

Autor: Truls Lynne Hansen, Ingelinn Aarnes, Inge Edvardsen, Erik Nyrnes, Magnar Gullikstad Johnsen

Publikováno v: SPE Drilling & Completion. 34:159-172

Summary The auroral zone is the region surrounding the geomagnetic North and South Poles, and it is where the largest and most frequent disturbances in the Earth's magnetic field are experienced. Because geomagnetic disturbances affect the accuracy o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fc2b83caeb5c6d767d3bfda7567ef751
https://doi.org/10.2118/189668-pa