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ESSEM Earth System Science and Environmental Management 17/11/2009 1 ESWW6-2 M. Messerotti, A. Marassi M. MESSEROTTI 1,2,3, A. MARASSI 1 1 INAF-Astronomical.

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Presentation on theme: "ESSEM Earth System Science and Environmental Management 17/11/2009 1 ESWW6-2 M. Messerotti, A. Marassi M. MESSEROTTI 1,2,3, A. MARASSI 1 1 INAF-Astronomical."— Presentation transcript:

1 ESSEM Earth System Science and Environmental Management 17/11/2009 1 ESWW6-2 M. Messerotti, A. Marassi M. MESSEROTTI 1,2,3, A. MARASSI 1 1 INAF-Astronomical Observatory of Trieste, IT 2 Department of Physics, University of Trieste, IT 3 INFN-Trieste Division, Trieste, IT

2  SCIENTIFIC RATIONALE  SOLAR RADIO BURST CHARACTERIZATION  SAMPLE DATA ANALYSIS  CONCLUSIONS 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 2

3  Under specific operational conditions, intense solar radio bursts (SRBs) have been observed to interfere wireless communications (e.g. Lanzerotti, 2007; Messerotti, 2008).  In particular, outstanding solar radio events have been identified as primary sources of significant GPS synchronization failures lasting for more than 10 minutes (e.g. Afraimovich et al., 2007, 2008; Messerotti, 2009a, 2009b). 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 3

4  In this work we suggest a scheme for SRB characterization in the single-frequency radio flux-time domain and we present its application on a sample outstanding SRBs detected by the Trieste Solar Radio System (TSRS) on 2005.07.14.  Specifically, we comment on the relevancy of this approach to the evaluation of wireless communication interference risk in space weather applications. 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 4

5 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 5

6  Solar radio flux density and circular polarization  237, 327, 408, 610, 1420, 2695 MHz  Radio indices at 1 min and 1 sec  High time resolution data at 1 ms  Online radio data archive with real-time data ingestion  ESA/SWENET Provider 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 6

7 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 7

8  A key factor in the evaluation of the interfering potentiality is represented by the statistics of the attention threshold exceeding and by the polarization time evolution (e.g. GPSs are sensitive to RH-polarized signals).  Apart from the maximum radio flux density level and predominant polarization sense, a full characterization of SRBs in terms of energetics and timing requires a high time resolution analysis of the event profile. 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 8

9  The evaluation of the interference risk by a SRB can be based on the following basic parameters derived from single frequency recordings: a)Radio flux density threshold exceeding b)Occurrence frequency of threshold exceeding time intervals over the SRB total duration c)Duration of threshold exceeding time intervals d)RH polarization time evolution during the event  Such parameters have to be cross- correlated with the response timings of a communication system (e.g. a GPS unit) 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 9

10  We started exploring the high time resolution analysis of potentially interfering SRBs on a Trieste Solar Radio System data set by:  Developing a dedicated software analysis tool to:  Display TSRS high time resolution (1 ms) data  Perform peak intensity, duration and occurrence analysis  Derive the relevant statistics  A sample analysis has been performed assuming an interference threshold of 1,000 SFU at 1420 MHz, RH-polarized solar radio data 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 10

11 SOLAR RADIO EVENTS RECORDED BY THE TRIESTE SOLAR RADIO SYSTEM IDENTIFICATION OF THRESHOLD EXCEEDING INTERVALS AND BASIC STATISTICS 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 11

12 CIRCULAR POLARIZATION:RIGHT-HANDED RADIO FLUX THRESHOLD :1000 SFU MINIMUM BLOCK DURATION:3 SECONDS 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 12

13 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 13

14 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 14BlockDuration Mean Flux STD100:01:10.798 1449.350 sfu 189.036 sfu 200:02:40.749 1460.372 sfu 246.273 sfu 300:00:04.927 1112.255 sfu 38.786 sfu 38.786 sfu 123

15 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 15 DURATION  EFFECTIVITY NO. OF BLOCKS: 3

16 CIRCULAR POLARIZATION:RIGHT-HANDED RADIO FLUX THRESHOLD :1000 SFU MINIMUM BLOCK DURATION:1 SECOND 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 16

17 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 17

18 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 18 1234BlockDuration Mean Flux STD100:00:01.019 1116.050 sfu 48.320 sfu 48.320 sfu 200:01:10.798 1449.350 sfu 189.036 sfu 300:02:40.749 1460.372 sfu 246.273 sfu 400:00:04.927 1112.255 sfu 38.786 sfu 38.786 sfu 500:00:01.592 1094.904 sfu 29.592 sfu 29.592 sfu 600:00:01.045 1034.233 sfu 4.198 sfu 4.198 sfu 56

19 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 19 NO. OF BLOCKS: 7

20 CIRCULAR POLARIZATION:RIGHT-HANDED RADIO FLUX THRESHOLD :1000 SFU MINIMUM BLOCK DURATION:100 MILLISECONDS 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 20

21 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 21

22 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 22

23 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 23

24 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 24

25 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 25 NO. OF BLOCKS: 64

26 CIRCULAR POLARIZATION:RIGHT-HANDED RADIO FLUX THRESHOLD :1000 SFU MINIMUM BLOCK DURATION:10 MILLISECONDS 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 26

27 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 27

28 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 28

29 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 29

30 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 30

31 NO. OF BLOCKS: 457 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 31

32  As experimentally proven, outstanding SRBs can interfere wireless communications, in particular GPS and GNSS  No SBR prediction system exists to date.  An effective characterization of SRBs is needed to set up a warning system.  We have outlined an interference risk evaluation scheme based on high time resolution, single- frequency time profile analysis.  The preliminary analysis shows the need to use the maximum time resolution for a proper characterization of the events.  The next step involves an extension of the SRB data set and the correlation with GPS data to identify possible failures associated with the radio enhancements in the light of the derived statistics. 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 32

33  Afraimovich, E.L., Demyanov V.V., Ishin A.B., Smolkov G.Ya.: Powerful solar radio bursts as a global and free tool for testing satellite broadband radio systems, including GPS–GLONASS– GALILEO. Journal of Atmospheric and Solar-Terrestrial Physics 70 (2008), 1985–1994.  Lanzerotti, L.J., Gary, D.E., Thomson, D.J., MacIennan, C.G.: Solar Radio Burst Event (6 April 2001) and Noise in Wireless Communications Systems. Bell Labs Technical Journal 7(1), 159- 163 (2002).  Messerotti, M.: TSRS as a Solar Radio Noise Monitor for Communication and Navigation Systems. Earth Moon Planet (2009) 104:51–54. 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 33

34 17/11/2009ESWW6-2 M. Messerotti, A. Marassi 34

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