1 / 12

SWPC RTSW Requirements for the post-DSCOVR era

SWPC RTSW Requirements for the post-DSCOVR era. Douglas Biesecker 10/28/2013. RTSW General Requirements. RTSW Measurement Requirements. Continuous Data Flow.

baka
Download Presentation

SWPC RTSW Requirements for the post-DSCOVR era

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SWPC RTSW Requirements for the post-DSCOVR era Douglas Biesecker 10/28/2013

  2. RTSW General Requirements

  3. RTSW Measurement Requirements

  4. Continuous Data Flow • On any day declared as a Critical Space Weather Day, solar wind data available to SWPC shall meet a 96% daily duty cycle. The minimum duty cycle in any 30 minute window shall be no less than 50%. • On all other days, solar wind data available to SWPC should meet a 96% daily duty cycle. The minimum duty cycle in any 30 minute window should be no less than 50%. • Any planned activities that would violate this shall be coordinated with and approved by SWPC, except where health and safety of the spacecraft and/or instruments is in question. • All gaps that exceed these requirements shall be actively worked to minimize the impact. • Open questions • Where does this apply? Transfer frames received? Processed data? Budget accordingly.

  5. Orbit • Measurements shall be taken within a conic volume of space with the axis centered on the Sun-Earth line whose maximum radius would have a Sun-Earth-Spacecraft angle of 11.5 degrees at a heliocentric distance of 0.99 AU and a minimum radius of 4.0 degrees (Sun Exclusion Zone) at a heliocentric distance of 0.99 AU. • As the measurement location moves close to the Sun, the maximum angle will need to shrink by TBD. Need to come up with a number for 0.98 AU. • Do we need to specify a requirement to close link margins for a 6m diameter ground station antenna with nominal efficiencies? • Does this eliminate the need to specify the SEZ radius? • Specify continous observation with existing RTSWnet?

  6. Latency • Data shall me available for use in operations within 5 minutes after completion of the measurement. • Allocate as appropriate between systems • Consider tightening this up. Experience shows that it doesn’t take much effort to do better than 5 minutes.

  7. Solar Wind Magnetic Field • At least one vector measurement (Bx, By, Bz) per 5 seconds. • Include meta-data to allow conversion to Geocentric Solar Magnetospheric coordinates within the required latency. • Range: 0 to 100 nT(TBR) for each component (along positive and negative axis) • Accuracy: Absolute accuracy of ±1 nanoTesla • Absolute accuracy of ±0.5 nanoTesla

  8. Solar Wind Thermal Plasma • At least one measurement of the solar wind velocity vector (Vx, Vy, Vz), average ion temperature, and ion density every 5 seconds. • Shall include meta-data to allow conversion to GSM coordinates within the required latency. • Velocity Range: 200-2500 (TBR) km/s with 5% accuracy. • Temperature Range: 40,000-2,000,000 K with 20% accuracy. • Density Range: 1-100 cm-3

  9. Solar Wind Energetic Plasma • At least one complete set of measurement every 5 minutes • At least 4 different differential flux channels covering the energy range from 50 keV to 1 MeV • Accuracy of 20%.

  10. Solar Wind Relativistic Protons • At least one measurement every 5 minutes • Sufficient channels to allow determination of >10 Mev, >50 MeV, and >100 MeV (TBR) integral fluxes. • Accuracy of 20%

  11. Solar Wind Electrons • At least one measurement every 1 minute • Measurement range 300-1300 keV • Accuracy of 20%

  12. Contamination • The RTSW requirements shall continue to be met during the following space weather conditions: • >10 MeV integral proton fluxes <= 1x105 pfu • Equivalent to an S5 Radiation Storm • 1-8 Angstrom X-ray flux <= 5x10-3 W/m2 • Equivalent to an X50 flare

More Related