scholarly journals Global‐Scale Ionospheric Tomography During the 17 March 2015 Geomagnetic Storm

Space Weather ◽  
2021 ◽  
Author(s):  
F. S. Prol ◽  
T. Kodikara ◽  
M. M. Hoque ◽  
C. Borries
2009 ◽  
Vol 36 (19) ◽  
Author(s):  
C. J. Pollock ◽  
A. Isaksson ◽  
J.-M. Jahn ◽  
F. Søraas ◽  
M. Sørbø

2007 ◽  
Vol 25 (9) ◽  
pp. 2053-2068 ◽  
Author(s):  
N. Longden ◽  
F. Honary ◽  
A. J. Kavanagh ◽  
J. Manninen

Abstract. The arrival of an interplanetary coronal mass ejection (ICME) triggered a sudden storm commencement (SSC) at ~09:22 UT on the 7 January 2005. The ICME followed a quiet period in the solar wind and interplanetary magnetic field (IMF). We present global scale observations of energetic electron precipitation during the moderate geomagnetic storm driven by the ICME. Energetic electron precipitation is inferred from increases in cosmic noise absorption (CNA) recorded by stations in the Global Riometer Array (GLORIA). No evidence of CNA was observed during the first four hours of passage of the ICME or following the sudden commencement (SC) of the storm. This is consistent with the findings of Osepian and Kirkwood (2004) that SCs will only trigger precipitation during periods of geomagnetic activity or when the magnetic perturbation in the magnetosphere is substantial. CNA was only observed following enhanced coupling between the IMF and the magnetosphere, resulting from southward oriented IMF. Precipitation was observed due to substorm activity, as a result of the initial injection and particles drifting from the injection region. During the recovery phase of the storm, when substorm activity diminished, precipitation due to density driven increases in the solar wind dynamic pressure (Pdyn) were identified. A number of increases in Pdyn were shown to drive sudden impulses (SIs) in the geomagnetic field. While many of these SIs appear coincident with CNA, SIs without CNA were also observed. During this period, the threshold of geomagnetic activity required for SC driven precipitation was exceeded. This implies that solar wind density driven SIs occurring during storm recovery can drive a different response in particle precipitation to typical SCs.


2020 ◽  
Vol 47 (3) ◽  
Author(s):  
Quan Gan ◽  
Richard W. Eastes ◽  
Alan G. Burns ◽  
Wenbin Wang ◽  
Liying Qian ◽  
...  

Space Weather ◽  
2006 ◽  
Vol 4 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yohsuke Kamide
Keyword(s):  

PsycCRITIQUES ◽  
2015 ◽  
Vol 6060 (2828) ◽  
Author(s):  
Laura E. Berk ◽  
Gregory S. Braswell ◽  
Adena B. Meyers ◽  
Rocío Rivadeneyra ◽  
Maria Schmeeckle
Keyword(s):  

2019 ◽  
Vol 10 (6) ◽  
pp. 489-500
Author(s):  
Andrea Valente ◽  
◽  
David Atkinson ◽  

This study aimed to investigate the conditions in which Bitcoin has developed as a leading cryptocurrency and, according to Nakamoto (2008), could become an instrument for everyday payments around the world. In comparison to other digital payment solutions, Bitcoin is based on a peer-to-peer electronic cash system using “the blockchain”. This innovative technology allows for decentralised storage and movement of currency in a fully anonymous way, introducing advantageous methods for encrypted security and faster transactions (Hagiu & Beach, 2014). Scepticism regards Bitcoin’s foundation, energy consumption and price volatility, however, did not take long to arise (Holthaus, 2017). Ten years from its white paper release, Bitcoin is further supported by the same drivers which could sustain its growth as the future of digital payments (Russo, 2018). In order to investigate the key drivers and feasibility of acceptance, a London based survey was used to understand the desirability of Bitcoin as a day-to-day tool for digital payments. Additionally, this research analysed Bitcoin’s stakeholders and forecast drivers of sustainability for its application to become the future of the payment industry. A space which relies on policies that involve multiple layers of society, governments, regulators and tech-firms, all on a global scale. The findings confirmed how the increasing lack of trust of political and financial institutions, coupled with the increasing cases of data-breaches by tech-firms, encouraged over 70% of respondents to consider more decentralised and anonymous methods for their day-to-day actions; like payments. Policy makers need to cope with societies increasingly separating politically but gathering together digitally (LBS, 2017). For Bitcoin to truly establish itself as a global digital payment solution, key stakeholder acceptance must converge alongside the introduction of more robust regulation.


2008 ◽  
Vol 27 (3) ◽  
pp. 5-21 ◽  
Author(s):  
L. Morell ◽  
C. Borri ◽  
H.J. Hoyer ◽  
S.A. Rajala ◽  
S. Ramakrishna ◽  
...  

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