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I. U. Observatorio del Ebro, Universitat Ramon Llull

Study of Geomagnetic Storm Effects Using Digisonde Network Data. E. Blanch b , B. W. Reinisch a, V. V. Paznukhov a , D. Altadill b,a ,. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell.

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I. U. Observatorio del Ebro, Universitat Ramon Llull

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  1. Study of Geomagnetic Storm Effects Using Digisonde Network Data E. Blanchb, B. W. Reinischa, V. V. Paznukhova, D. Altadillb,a, I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell a) Center for Atmospheric Research University of Massachusetts Lowell 600 Suffolk Str., 3rd floor Lowell, MA 01854, USA b) Observatorio del Ebro Universitat Ramon Llull Crta. de l'Observatori, No. 8 E43520-Roquetes, SPAIN IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 1

  2. OUTLINE I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell Nine major storms of 2001-2005 Electron density profiles hmF1, foF1, hmF2 & foF2 Strong ionospheric uplift; TAD’s effects Analysis of the mid-latitude ionosphere Response to geomagnetic storms Digisonde network database European and American sectors IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 2

  3. Examples of Ionograms Uplift + G condition at mid-latitudes I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell Chilton, Aug 24, 2005 Nine main storms analyzed: 11 September 2005, 24 August 2005, 15 May 2005, 21 January 2005 5 December 2004, 7 November 2004, 22 July 2004, 22 January 2004 20 November 2003 (~20,000 ionograms validated) IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 3

  4. Results: August 24, 2005 Helio-geophysical conditions I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 4

  5. Results: August 24, 2005 European sector (profiles) I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell SSC IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 5

  6. Results: August 24, 2005 European sector (characteristics) SSC = 06:13 UT I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell SSC SSC IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 6

  7. Results: August 24, 2005 American sector (profiles) I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell SSC IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 7

  8. Results: August 24, 2005 American sector (characteristics) SSC = 06:13 UT I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell SSC SSC IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 8

  9. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Results: August 24, 2005 Uplift at both sectors SSC = 06:13 UT Chilton Millstone Hill Pruhonice Boulder Ebro Wallops Is. SanVito Eglin Athens Jicamarca IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 9

  10. Results: August 24, 2005 Summary of observations. ► Positive foF2 effect in Europe, negative effect in America above 40°N following the storm commencement; negative effect in Europe ~12 hours later. ► Clear ionosphere uplifting in both sectors (America & Europe). ► hmF2 uplift delay of about 1 h in America and 2 h in Europe. ► Latitudinal delay of the uplift, from higher to lower latitudes. ► TAD effects in the European sector. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 10

  11. Results: August 24, 2005 Geomagnetic storm impact mechanism I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell Prölss, 1993; Fuller-Rowell et al., 1995 IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 11

  12. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Results: August 24, 2005 Geomagnetic storm impact mechanism US EU N-S disturbance propagation speed: ~600 m/s IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 12

  13. San Vito foF2 Pruhonice foF2 Bjønøya Hcomp Results: August 24, 2005 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell (from OVATION database) IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 13

  14. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell August 24, 2005, IRI modelling IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 14

  15. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Negative storms local time dependence All storms IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 15

  16. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Positive storms local time dependence IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 16

  17. Concluding Remarks ► The results presented suggest that the main driver of this ionospheric response is neutral wind and composition change bulge supporting the storm development model suggested by Prölss, [1993]. ► In our study we were able to reconstruct the local time dependence of the storm effects ► Other storms effects do not manifest themselves systematically (GW, + or - f0F2 effect, shock effects, … ). ► IRI model does not reproduce the observed uplifting of the ionosphere during the storm time. ► Digisonde worldwide network offers an excellent tool for studying spatial effects of the magnetic storms. It provides an advantage of looking into the altitude distribution of the ionospheric reaction. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 17

  18. THANK YOU I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 18

  19. Results: January 21, 2005 European sector (profiles) I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 19

  20. Results: January 21, 2005 American sector (profiles) I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 20

  21. Results: January 21, 2005 Uplift at both sectors SSC = 17:11 UT I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 21

  22. Nivel 1. ► Nivel 2. Nivel 3. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 22

  23. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 23

  24. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Athens Results: May 15, 2005 IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 24

  25. Results: May 15, 2005 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 25

  26. Results: May 15, 2005 Summary of observations. ► Negative effect in both US and Europe (lat > 40°N), some positive effect at SanVito (lat < 40 °N) ► Clear ionosphere uplifting in both sectors (America & Europe). Different uplift delay (1+ h NA, 1.5+ EU). ► Latitudinal delay of the uplift, from higher to lower latitudes. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell US EU IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 26

  27. Summary of storm observations Storms in detail. ► 2005/08/24 (06:13 UT) Clear ionosphere uplifting in both sectors (America & Europe). Different uplift delay (1+ h NA, 1.5+ EU). N-S uplift delay. + f0F2 effect EU,- f0F2 effect NA. GW (TAD’s) in EU, N-S propagation. ► 2005/05/15 ( 02:38 UT) Clear uplift in both sectors. Different uplift delay (1+ h NA, 1.5+ EU). N-S uplift delay. + f0F2 effect EU (lat < 40°N),- f0F2 effect in NA & EU (lat > 40°N). GW (TAD’s) in EU (lat < 40°N). ► 2005/01/21 (17:11 UT) Clear uplift in both sectors. Simultaneous uplift delay (1.5 - 2 h). N-S uplift delay. No clear + or - f0F2 effect. No GW. ► 2004/12/05 (07:46 UT) Weak uplift in America. No clear N-S uplift delay (1.5 - 2 h). ► 2004/11/07 (18:27 UT) Clear uplift in both sectors. Different uplift delay (1.5+ EU, 2+ h NA). N-S uplift delay. ► 2003/11/20 (08:03 UT) Weak uplift in both sectors (Very Strong secondary Uplift 8 +). Different uplift delay (0.5+ h NA, 1. + EU). N-S uplift delay. I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 27

  28. I. U. Observatorio del Ebro, Universitat Ramon Llull • Center for Atmospheric Research, University of Massachusets Lowell Local time map US EU IRI/COST 296 WORKSHOP; 10-14 July 2007, Prague, Czech Republic 28

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