Ny-lesund across solar cycles 23 and 24 L. Spogli 1,2 , G. De - - PowerPoint PPT Presentation

Mutual benefits between atmospheric research and radio based science over polar regions 4 December 2017 - Royal Observatory of Belgium

Ionospheric scintillation climatology at Ny-Ålesund across solar cycles 23 and 24

• L. Spogli1,2, G. De Franceschi1, L. Alfonsi1, C.

Cesaroni1, V. Romano1,2 and I. Hunstad1

1Istituto Nazionale di Geofisica e Vulcanologia, Italy 2SpacEarth Technology, Italy

Summary

 Studying ionospheric irregularities with GNSS  The Ny-Ålesund ionospheric station  Overview scintillation climatology over more than 1 solar cycle  Present and future status of the ionospheric studies at Ny-Ålesund  Final remarks

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Studying ionospheric irregularities with GNSS

The formation of ionospheric irregularities at high latitudes is driven by the forcing from the geospace

∆𝑜 ≈ − 𝑠

𝑓𝜇2

2𝜌 ∆𝑂 Ionospheric irregularities, i.e. Fluctuations of ambient electron density DN Fluctuations of the refractive index Dn Scintillation: phase and amplitude sudden fluctuations of the trans-ionospheric e.m. wave HOW TO STUDY SCINTILLATION: Radio signals carry memory of the ionosphere portion they cross.

Scintillation indices

INGV contributed to the PolaRxS development in the frame of CIGALA project (funded by FP7, ended Jan 2012)

50 Hz sampling 1-min values

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Loss of lock with the satellite Reduced accuracy of positioning

GNSS

The Ny-Ålesund ionospheric station (Lat: 78.92° N, Mlat: 75.25° N )

Data available in the INGV ionospheric data repository: http://www.eswua.ingv.it www.spaceweather.it GSV4004 scintillation data since 9/2003

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

PolaRxS data since November 2015

Quiet conditions IQ = 0 Disturbed conditions IQ = 6

Feldstein, Y. I, 1963 Holzworth, R. H. and Meng, C., 1975

The Ny-Ålesund ionospheric station is the perfect site to study scintillations in the auroral/cusp/cap regions

Dirigibile Italia Station

Unprecedented scintillation climatology over more than 1 solar cycle

Solar cycle 23 Solar cycle 24

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

GSV4004 scintillation data on GPS L1

Unprecedented scintillation climatology over more than 1 solar cycle

Ground Based Scintillation Climatology (GBSC) Occurrence of phase and amplitude scintillation above the weak (0.1) and the moderate (0.25) thresholds

Spogli et al. (2009) Ann.Geophys. Alfonsi et al. (2011) Rad.Sci.

𝑃 % = 𝑂(𝑞 > 𝑈) 𝑂𝑢𝑝𝑢 𝑃(sF) ≫ 𝑃(S4)

Mean and Standard Deviation of the Rate of Total Electron Content change (ROT)

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Climatological analysis is of support to understand which part

• f the ionosphere are more subject to signal degradation

Phase scint occurrence Amplitude scint occurrence ROT Mean & SD

Unprecedented climatology: dependence on IMF

Statistical convection patterns sorted by IMF clock angle for 5 nT < BT < 10 nT. Color indicates the electric potential from SuperDarn measurements. Pettigrew, E. D. et al., 2010

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

AL AU

|AU|,|AL| > 400 nT |AU|,|AL| < 400 nT

Unprecedented climatology: dependence on auroral activity

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Unprecedented climatology: dependence on geomagnetic disturbance level

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Present and future status of the ionospheric studies at Ny-Ålesund

New PolaRxS receiver installed in 2015 Multiconstellation capabilities (GPS+GLONASS+GALILEO)

Data available in the new eSWua website

GPS Galileo

sF>0.1 sF>0.1

Mutual benefits between atmospheric research and radio based science over polar regions

4 December 2017 - Royal Observatory of Belgium

Year 2016 data

Remarks

First climatology of the L-band scintillation occurrence over more than one solar cycle Magnetic Noon and pre-midnight sectors are the hot spots for the formation of scintillation- effective irregularities Fragmentation of the tongue of ionization in the cusp/cleft and cap regions

Configuration of the statistical patterns of convection cells sorted according to the IMF Bz/By conditions

Sorting according to the AU/AL conditions allows identifying the role of the inflow/outflow of plasma from/to the plasmasphere The PolaRxS receiver installed in 2016 extends the capability

• f the Ny-Ålesund station through the inclusion of the GALILEO information

Climatological analysis is then of support to understand which part of the ionosphere are more subject to signal degradation Help for modelling and climatological forecasting in support of accounting for the ionospheric impact in atmospheric sciences and applications

luca.spogli@ingv.it