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

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Presentation on theme: "I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell IRI/COST 296 WORKSHOP; 10-14 July."— Presentation transcript:

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

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

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

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

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

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

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

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

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 IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 9 Millstone Hill Boulder Wallops Is. Eglin Jicamarca Chilton Pruhonice Ebro Athens SanVito

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

11 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell Results: August 24, 2005 Geomagnetic storm impact mechanism Prölss, 1993; Fuller-Rowell et al., 1995 IRI/COST 296 WORKSHOP; 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 IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 12 N-S disturbance propagation speed: ~600 m/s US EU

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

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; 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 IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 15 All storms

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; July 2007, Prague, Czech Republic 16

17 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell 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 - f 0 F2 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. IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 17

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

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

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

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

22 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell Nivel 1. ► Nivel 2. Nivel 3. IRI/COST 296 WORKSHOP; 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; July 2007, Prague, Czech Republic 23

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

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

26 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell 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. IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 26 US EU

27 I. U. Observatorio del Ebro, Universitat Ramon Llull Center for Atmospheric Research, University of Massachusets Lowell 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. + f 0 F2 effect EU, - f 0 F2 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. + f 0 F2 effect EU (lat < 40°N), - f 0 F2 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 ( h). N-S uplift delay. No clear + or - f 0 F2 effect. No GW. ► 2004/12/05 (07:46 UT) Weak uplift in America. No clear N-S uplift delay ( 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. IRI/COST 296 WORKSHOP; 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 IRI/COST 296 WORKSHOP; July 2007, Prague, Czech Republic 28 US EU


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