The Evolving Space Weather System-Van Allen Probes Contribution

Space Weather ◽  
2014 ◽  
Vol 12 (10) ◽  
pp. 577-581 ◽  
Author(s):  
L. J. Zanetti ◽  
B. H. Mauk ◽  
N. J. Fox ◽  
R. J. Barnes ◽  
M. Weiss ◽  
...  
Keyword(s):  
Space Weather ◽  
Weather System ◽  
Van Allen Probes

Simulations of the Relativistic Radiation Belt Electrons Using the VERB-3D Code

2021 ◽  
Author(s):  
Dedong Wang ◽  
Yuri Shprits ◽  
Alexander Drozdov ◽  
Nikita Aseev ◽  
Irina Zhelavskaya ◽  
...  
Keyword(s):  
Space Weather ◽  
Radiation Belt ◽  
Model Performance ◽  
Dynamic Evolution ◽  
Relativistic Electrons ◽  
Outer Radiation Belt ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
Radiation Belt Electrons ◽  
Simulation Results

<p>Using the three-dimensional Versatile Electron Radiation Belt (VERB-3D) code, we perform simulations to investigate the dynamic evolution of relativistic electrons in the Earth’s outer radiation belt. In our simulations, we use data from the Geostationary Operational Environmental Satellites (GOES) to set up the outer boundary condition, which is the only data input for simulations. The magnetopause shadowing effect is included by using last closed drift shell (LCDS), and it is shown to significantly contribute to the dropouts of relativistic electrons at high $L^*$. We validate our simulation results against measurements from Van Allen Probes. In long-term simulations, we test how the latitudinal dependence of chorus waves can affect the dynamics of the radiation belt electrons. Results show that the variability of chorus waves at high latitudes is critical for modeling of megaelectron volt (MeV) electrons. We show that, depending on the latitudinal distribution of chorus waves under different geomagnetic conditions, they cannot only produce a net acceleration but also a net loss of MeV electrons. Decrease in high‐latitude chorus waves can tip the balance between acceleration and loss toward acceleration, or alternatively, the increase in high‐latitude waves can result in a net loss of MeV electrons. Variations in high‐latitude chorus may account for some of the variability of MeV electrons. </p><p>Our simulation results for the NSF GEM Challenge Events show that the position of the plasmapause plays a significant role in the dynamic evolution of relativistic electrons. We also perform simulations for the COSPAR International Space Weather Action Team (ISWAT) Challenge for the year 2017. The COSPAR ISWAT is a global hub for collaborations addressing challenges across the field of space weather. One of the objectives of the G3-04 team “Internal Charging Effects and the Relevant Space Environment” is model performance assessment and improvement. One of the expected outputs is a more systematic assessment of model performance under different conditions. The G3-04 team proposed performing benchmarking challenge runs. We ‘fly’ a virtual satellite through our simulation results and compare the simulated differential electron fluxes at 0.9 MeV and 57.27 degrees local pitch-angle with the fluxes measured by the Van Allen Probes. In general, our simulation results show good agreement with observations. We calculated several different matrices to validate our simulation results against satellite observations.</p>

Towards an integrated model of the space weather system

2004 ◽  
Vol 66 (15-16) ◽  
pp. 1241-1242 ◽  
Author(s):  
W. Jeffrey Hughes ◽  
Mary K. Hudson
Keyword(s):  
Space Weather ◽  
Integrated Model ◽  
Weather System

Space Weather Operation at KASI With Van Allen Probes Beacon Signals

Space Weather ◽  
2018 ◽  
Vol 16 (2) ◽  
pp. 108-120
Author(s):  
Jongkil Lee ◽  
Kyung-Chan Kim ◽  
Romeo Giuseppe ◽  
Sasha Ukhorskiy ◽  
David Sibeck ◽  
...  
Keyword(s):  
Space Weather ◽  
Van Allen Probes

Building and Using Coupled Models for the Space Weather System: Lessons Learned

Space Weather ◽  
2009 ◽  
Vol 7 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Daniel N. Baker ◽  
Jack Quinn ◽  
Jeffrey Hughes ◽  
John Lyon ◽  
Jon Linker ◽  
...  
Keyword(s):  
Space Weather ◽  
Lessons Learned ◽  
Coupled Models ◽  
Weather System

scholarly journals The Global Positioning System constellation as a space weather monitor: Comparison of electron measurements with Van Allen Probes data

Space Weather ◽  
2016 ◽  
Vol 14 (2) ◽  
pp. 76-92 ◽  
Author(s):  
Steven K. Morley ◽  
John P. Sullivan ◽  
Michael G. Henderson ◽  
J. Bernard Blake ◽  
Daniel N. Baker
Keyword(s):  
Global Positioning System ◽  
Space Weather ◽  
Positioning System ◽  
Global Positioning ◽  
Van Allen Probes

scholarly journals A GOLDen Way to Study Space Weather

Eos ◽  
2020 ◽  
Vol 101 ◽  
Author(s):  
Mark Zastrow
Keyword(s):  
Space Weather ◽  
Upper Atmosphere ◽  
Weather System ◽  
Nasa Mission

A NASA mission is observing airglow in the upper atmosphere and uncovering what it tells us about Earth’s space weather system.

LOFAR4SpaceWeather (LOFAR4SW) – Increasing European Space-Weather Capability with Europe’s Largest Radio Telescope: Beyond the Detailed Design Review (DDR)

2020 ◽  
Author(s):  
Mario M. Bisi ◽  
Mark Ruiter ◽  
Richard A. Fallows ◽  
René Vermeulen ◽  
Stuart C. Robertson ◽  
...  
Keyword(s):  
The Netherlands ◽  
Radio Telescope ◽  
Space Weather ◽  
Low Frequency ◽  
Regular Space ◽  
The Sun ◽  
Weather System ◽  
Design Review ◽  
Detailed Design ◽  
Horizon 2020

<p>The Low Frequency Array (LOFAR) is an advanced phased-array radio-telescope system based across Europe.  It is capable of observing over a wide radio bandwidth of ~10-250 MHz at both high spatial and temporal resolutions.  LOFAR has capabilities that enable studies of many aspects of what we class as space weather (from the Sun to the Earth and afar) to be progressed beyond today’s state-of-the-art.   However, with the present setup and organisation behind the operations of the telescope, it can only be used for space-weather campaign studies with limited triggering availability.  This severely limits our ability to effectively use LOFAR to contribute to space-weather monitoring/forecast beyond its core strength of enabling world-leading scientific research.  LOFAR itself is made up of a dense core of 24 stations near Exloo in The Netherlands with an additional 14 stations spread across the northeast Netherlands.  In addition to those, there are a further 13 stations based internationally across Europe.  These international stations are, currently, six in Germany, three in northern Poland, and one each in France, Ireland, Latvia, Sweden, and the UK.  Further sites are under preparations (for example, in Italy).</p><p> </p><p>We are undertaking a Horizon 2020 (H2020) INFRADEV design study to undertake investigations into upgrading LOFAR to allow for regular space-weather science/monitoring observations in parallel with normal radio-astronomy/scientific operations.  This project is called the LOFAR For Space Weather (LOFAR4SW) project (see: http://lofar4sw.eu/).  Our work involves all aspects of scientific and engineering work along with end-user and political engagements with various stakeholders.  This is with the full recognition that space weather is a worldwide threat with varying local, regional, continent-wide impacts, and also global impacts – and hence is a global concern.</p><p> </p><p>Here, we summarise the most-recent key aspects of the LOFAR4SW progress including outputs/progress following the Detailed Design Review (DDR) that took place at ASTRON, The Netherlands, in March 2020, as well as the implementation of recommendations from the earlier Preliminary Design Review (PDR) with an outlook to the LOFAR4SW User Workshop the week following EGU 2020.  We also aim to briefly summarise a key set of the longer-term goals envisaged for LOFAR to become one of Europe’s most-comprehensive space-weather observing systems capable of shedding new light on several aspects of the space-weather system, from the Sun to the solar wind to Jupiter and Earth’s ionosphere.</p>

Dispersionless and Weakly Dispersed Injections in the Dayside Magnetosphere with Evidence of Mirror Wave Signatures

2020 ◽  
Author(s):  
Matthew Cooper ◽  
Andrew Gerrard ◽  
Louis Lanzerotti ◽  
Gareth Perry ◽  
Rualdo Soto-Chavez
Keyword(s):  
Solar Wind ◽  
Space Weather ◽  
Observational Evidence ◽  
Bow Shock ◽  
Inner Magnetosphere ◽  
Sudden Drop ◽  
Wind Speeds ◽  
Van Allen Probes ◽  
Local Magnetic Time ◽  
First Time

<p>We present observational evidence of mirror waves in the dayside inner magnetosphere as measured with instrumentation on the dual NASA Van Allen Probes spacecraft.  While mirror waves near the dayside bow shock have been reported from several spacecraft missions (e.g. Cluster, THEMIS, MMS), their presence in the dayside inner magnetosphere has not been reported.  We speculate that the mirror modes are associated with direct dayside injections under negative Bz conditions, and drift to lower L-shells.  The analyzed event coincides with the main phase of a CME shock-induced space weather storm, with high solar wind speeds in excess of 700 km/s and a sudden drop in Dst occurring approximately eight hours prior to the event.  The highest plasma beta values were measured by spacecraft B at 12:24 at magnetic noon at L ~ 4.5-5.5.  Spacecraft A later measured a similar feature at 13:00 local magnetic time.  The potential presence of such mirror waves would indicate dayside sources of anisotropy inside the magnetopause, or the penetration of bow shock particles into the dayside inner L-shells.  To our knowledge, this is the first time such waves have been reported in the inner magnetosphere.</p>

scholarly journals A new climatological electron density model for supporting space weather services

2021 ◽  
Author(s):  
M Mainul Hoque ◽  
Norbert Jakowski ◽  
Fabricio S. Prol
Keyword(s):  
Electron Density ◽  
Space Weather ◽  
Peak Height ◽  
Density Model ◽  
Solar Irradiation ◽  
Electron Content ◽  
Total Electron ◽  
In Situ Data ◽  
Van Allen Probes

The ionosphere is the ionized part of the Earth atmosphere, ranging from about 60 km up to several Earth radii whereas the upper part above about 1000 km height up to the plasmapause is usually called the plasmasphere. We present a new three-dimensional electron density model aiming for supporting space weather services and mitigation of propagation errors for trans-ionospheric signals. The model is developed by superposing the Neustrelitz Plasmasphere Model (NPSM) to an ionosphere model composed of separate F and E-layer distributions. It uses the Neustrelitz TEC model (NTCM), Neustrelitz Peak Density Model (NPDM) and the Neustrelitz Peak Height Model (NPHM) for the total electron content (TEC), peak ionization and peak height information. These models describe the spatial and temporal variability of the key parameters as function of local time, geographic/geomagnetic location, solar irradiation and activity. The model is particularly developed to calculate the electron concentration at any given location and time in the ionosphere for trans-ionospheric applications and named as the Neustrelitz Electron Density Model (NEDM2020). A comprehensive validation study is conducted against electron density in-situ data from DMSP and Swarm, Van Allen Probes and ICON missions, and topside TEC data from COSMIC/FORMOSAT-3 mission, bottom side TEC data from TOPEX/Poseidon mission and ground-based TEC data from International GNSS Service (IGS) covering both high and low solar activity conditions. Additionally, the model performance is compared with the 3D electron density model NeQuick2. Our investigation shows that the NEDM2020 performs better than the NeQuick2 when compared with the in-situ data from Van Allen Probes and ICON satellites and TEC data from COSMIC and TOPEX/Poseidon missions. When compared with DMSP and IGS TEC data both NEDM2020 and NeQuick2 perform very similarly.

Europe's First Space Weather Think Tank

Space Weather ◽  
2004 ◽  
Vol 2 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Anna Belehaki ◽  
Jean Lilensten ◽  
Toby Clark
Keyword(s):  
Space Weather ◽  
Think Tank
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