1. 2009 Jun 24The Solar Science Data Center F. Breitling 1 The Solar Science Data Center F. Breitling, G. Mann, C. Vocks, H. Enke 2 nd Workshop of the Solar Key Science Project of LOFAR Astrophysikalisches Institut Potsdam 2009 June 24

2. 2009 Jun 24The Solar Science Data Center F. Breitling 2 Contents Motivation Solar observation time with LOFAR Solar observation modes with LOFAR Yearly data volume from LOFAR First steps Outlook: data from other observatories

3. 2009 Jun 24The Solar Science Data Center F. Breitling 3 Motivation Effective solar monitoring requires multi-wavelength data of high resolution LOFAR adds images at 30-240MHz of high resolution Data at other wavelength is needed It would be nice to have a virtual solar observatory, which can make all data available => Solar Science Data Center (SSDC)

4. 2009 Jun 24The Solar Science Data Center F. Breitling 4 Yearly observation time at Exloo (core stations) altitude >10° above horizon => t obs =~8 h/d =10x10 6 s/y (Maximum possible)

5. 2009 Jun 24The Solar Science Data Center F. Breitling 5 Spectrometer Mode frequency range –30-80 MHz –120-240 MHz bandwidth 100 kHz => 1700 channels time resolution 100/s sampling resolution 2 byte  data rate r s =340 kB/s =3.4 TB/y }=> 170 MHz

6. 2009 Jun 24The Solar Science Data Center F. Breitling 6 Burst mode 22 observations frequencies –low band –high band time resolution 10/s image size 0.45 MB Used for 10% of observation time  data rate r b = 100 MB/s = 100TB/y Frequency Nr.123456789 Frequency [MHz]404550556065707580 Frequency Nr.10111213141516171819202122 Frequency [MHz]120130140150160170180190200210220230240

7. 2009 Jun 24The Solar Science Data Center F. Breitling 7 Monitoring mode 4 observation frequencies time resolution 1/min image size 0.45 MB 90% of observation time  data rate b m = 26 kB/s =0.23 TB/y Frequency Nr.1234 Frequency [MHz]4080120240

8. 2009 Jun 24The Solar Science Data Center F. Breitling 8 Yearly data volume of solar observations with LOFAR (assuming maximum observation time of 8h/d) Observation mode Data rate [MB/s] Data per year [TB/yr] Spectrometer0.343.4 Burst100 Monitoring0.030.23 => Burst mode needs 95% of total storage of ~100 TB/y

9. 2009 Jun 24The Solar Science Data Center F. Breitling 9 First steps Of the SSDC towards a virtual solar observatory Relation to LOFAR archive? External part or backup?

10. 2009 Jun 24The Solar Science Data Center F. Breitling 10 Outlook Data from other experiments Ground-based observatories –Observatorium Tremsdorf (40-800 MHz high res. radio spectrum) –Sonnenobservatorium Kanzelhöhe (H-alpha) –Others Space missions –SDO (optical, UV, EUV) –STEREO (EUV, coronagraph) –Hinode (optical, EUV, X-ray) –RHESSI (hard X-ray) –SOHO (optical, UV, EUV) –GOES (soft X-ray) –Solar Orbiter, Solar Probe