Enabling Technology Development:

• High cadence imaging spectrograph development

• Low mass/power instrumentation

• Advanced communication/DSN for future deployment to Sentinel or remote locations

Science Objectives:• Determine the most relevant observational signatures of

flare, CME, and Solar Particle Event (SPE) eruption • Identify precursor signatures which can be used to

forecast flare, CME, and SPE eruption • Identify what is needed to improve our ability to nowcast

and forecast space weather & SPEs• Identify the physical mechanisms of mass flow and

energy release in the solar atmosphere• Determine the interaction and connectivity of structures

throughout the solar atmosphere

Space Weather Imaging Sentinel (SWIS)

Mission Description: (Near/Intermediate Term)• Example Mission Design

- 1 spacecraft, 5 Hi-TRL instruments (4 remote, 1 in-situ) - L1 or Geo or 98°, 600 km sun-synch orbit

- continuous solar viewing

- 3-axis stabilized, 30 arc-sec pointing capability- Payload: 40 kg, 53 W, 2.2 Mbps

Measurement Strategy:• UV/EUV Imaging Spectrograph for flow velocities & energy buildup

& release signatures, both on the disk and off-limb (out to 3 Rs)• Filter Magnetograph for surface magnetic field measurements• Chromospheric/Coronal EUV Imagers for morphology and dynamics• Energetic Particles (SEP) measurements for event characterization• Coronagraph for detection & characterization of Halo CMEs

Associated RFAs:• RFA F1: “Understand magnetic reconnection as

revealed in solar flares, CMEs,…” • RFA F2: “Understand the plasma processes that

accelerate and transport particles.”• RFA J2: “Develop the capability to predict the origin

and onset of solar activity and disturbances associated with potentially hazardous space weather events.”

SWISInstrument Summary

Instrument Mass (kg) Power (w) Data Rate (Mbps)

UV/EUV Spectrograph 20 35 1

Filter Magnetograph 6 6 0.5

Chromospheric/Coronal EUV Imager(s)

5.6 3 0.5

Coronagraph 5.2 3 0.2

Energetic Particles Detector 3 6 0.01

TOTAL 39.8 53 2.21

• Instrument payload complement/characteristics provided by cognizant science advocates within Heliophysics community.

SWISConceptual Block Diagram

POWER

PAYLOAD ATTITUDE CONTROL

TELECOMMUNICATIONS

BATTERY

OMNIS

HGA

ChromosphericCoronal EUV

Imager(s)

FilterMagnetograph

UV/EUVSpectrograph

Energetic ParticlesDetector

Coronagraph

PYROTECHNICS

PROCESSOR & LOCAL MEMORYFLIGHT S/W - CMD, TLM, Fault Prot.

COMMAND &DATA HANDLING

HEATERSSENSORS

THERMOSTATS

THERMAL

POWERDISTRIBUTION

UNIT

REACTIONWHEELS

S/C POWER

BUSPWRAMP

DATAPROCESSING

UNIT

SOLAR ARRAYS

THERMALINTERFACE

UPLINK/DOWNLINKINTERFACE

DC/DC CONVERTER

TRANSPONDER

AVIONICS cPCI BACKPLANE

SCIENCE INSTRUMENT INTERFACE

SYSTEM I/O INTERFACES

COARSE SUN

SENSORS

TORQUEBARS

IMU

STARCAMERA

G

MAGNETOMETER