WG4: Ground support to space-weather missions

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Presentation transcript:

WG4: Ground support to space-weather missions D.A. Biesecker (NOAA/SWPC) and KiChang Yoon (KSWC)

Overview Ground data processing will be covered in the next talk ESA ground station network in the subsequent talk I’m only addressing what is used for existing RTSW or Beacon networks Begin with a review of existing ‘operational’ (i.e. 24x7 networks) ACE/DSCOVR - RTSW STEREO What is promised for the future What is proposed for the future

Real-Time Solar Wind Network Real-Time Solar Wind (RTSW) given that name by Zwickl et al. (1998) Began in 1998 for the purpose of providing ACE data in real-time ACE began the era of ‘space weather beacons’ RTSW now is used to reference any real-time, continuous solar wind data stream Original partners were ISRO (India); RAL (UK); NICT (Japan); and NOAA (Boulder) ISRO dropped out very early on RAL replaced by Germany (DLR) in 2009 Korea (KSWC) added in 2012 Main issue with RTSW is it is a northern hemisphere network.

RTSWnet/NOAA RTSWnet NOAA FCDAS (21m) DLR (6m) BLDR (6m) NICT (11m) WCDAS (18m) KSWC (13m)

L1 Tracking S-band (2278 MHz) 434 bps Range ~1.5E6 km ACE DSCOVR S-band (2278 MHz) 434 bps Range ~1.5E6 km Convolutional coding Rate=1/2 Reed-Solomon Error Correction Dishes as small as 3m have been used S-band (2215 MHz) 20 kbps (138 kbps high rate) Range ~1.5E6 km Convolutional coding Rate = ½ Reed-Solomon Error Correction Dishes of 6m have plenty of margin In fact, Boulder’s 6m dish regularly receives the 138 kbps high rate

Current DSCOVR Tracking Asia National Institute of Information and Communications Technology (JAPAN) Korean Space Weather Center Europe German Aerospace Center Americas NOAA Wallops Island VA NOAA Boulder, CO NOAA Fairbanks, AK Johns Hopkins University Applied Physics Laboratory (as needed) US Air Force provides tracking as needed.

DSCOVR tracking

Current ACE tracking DLR (German Aerospace) Kiel (a STEREO tracking partner) NOAA Wallops NASA DSN And all DSCOVR stations can track ACE if needed

STEREO Tracking X-band (8443 MHz) 633 bps Range ~1.3E8 km Turbo* encoding Rate=1/6 Reed-Solomon Error Correction * Turbo was patented by France Telecom. Patents have expired. That means I deal with few lawyers than I used to.

Current STEREO Tracking Asia National Institute of Information and Communications Technology (JAPAN) Korean Space Weather Center Europe AMSAT-DL (Bochum, Germany) Centre National d’Etudes Spatiale (Toulouse, France) DL0SHF (Kiel-Roenne, Germany) Americas Johns Hopkins University Applied Physics Laboratory (as needed)

STEREO Tracking Sites (Turbo) Dedicated station As available BOCHUM (20m) KIEL (9m) NICT (11m) CNES (9m) JHU/APL (18m) KSWC (13m)

Other relevant sites 25m dish in Raisting, Germany Student run NOAA funded SBIR to look at ground networks for future space weather needs (L1, L5) Phase II of SBIR will investigate existing commercial station availability, capabilities, and costs.

Promised for L5 Well, ESA and UK Space will have to answer that question KSWC, as they did for ACE and STEREO, stands ready to build an antenna that meets requirements

Possible for L5 Depending on the real-time data volume, lots Borrow from STEREO? NOAA? Use SWAP 6.2.4 Letter from Volz (NESDIS AA) to Rolf Densing (ESA) Potential partnership

SWAP Report Recommendations Upgrades at Boulder A new antenna to provide year-round coverage, even at higher bit rates. For long term considerations, we suggest this be something that could handle downlinks from spacecraft at L1 or L5. Preliminary estimates are that a dish of up to 15m might be required for L5. SWPC received a quote for a 13m dish in 2014 for $1.01M Two antennas would provide necessary redundancy Upgrades at WCDAS An additional antenna capable of uplink and downlink that can handle L1 and at least downlink of data from an L5 mission. This would enable redundancy within WCDAS as well as provide potential support to an international L5 mission. Upgrades at FCDAS A new antenna capable of uplink and downlink that can handle L1 and at least downlink of data from an L5 mission. This would ensure that should WCDAS go down, both GOES and the L1 mission could be tracked from FCDAS.