Amal Chandran, PI, LASP/University of Colorado

Transcription

1 Ionospheric studies with cubesats: INSPIRESat-1 carrying the Compact Ionosphere Probe: Amal Chandran, PI, LASP/University of Colorado 2017 INSPIRE WORKSHOP

2 LASP Cubesats The Colorado Space Weather Experiment Relativistic Electron Proton Telescope Funded by the NSF Launched in 2012 operated for 28mo Collected over 100MB of Science Data Generated over 19 peer reviewed publications First NASA SMD CubeSat Launched Dec 6, 2015 Deployed May 2016 Achieved full success S/N 001 BCT XACT Coordinated in AES projects course Reentry May 2017 MinXSS-2 scheduled to launch 2Q17

3 A new model for satellite development

4 INSPIRESat-1 Breakdown of Responsibilities Spacecraft S/C I&T Launch Operations Structure Thermal CDH & FSW ADCS Comm EPS CIP CPT Tvac Vib S/C-LV I&T LASP/CU IIST NCU SQU LATMOS Kyutech NTU

5 INSPIRESat-1 Organizational Structure Amal Chandran LASP PI Loren Chang NCU PI Priyadarshan IIST PI Will Evonosky Student PM/SE ADCS Ya Chih Mao Student PM/SE Kaustubh Student PM/SE Spencer Boyajian Structures & Thermal Yi Duann Comm Rong Tsai Lin EPS Ankit Verma CDH Niwhashini FSW Chi Kuang Chao CIP - PI Tzu-Wei Fang, Science Lead Tomoko Matsuo Will Evonosky Shih-Chi Chiu Charles Lin Tiger Liu Tarun Pant Science Team

6 INSPIRE Year 1 (Fall Fall 2017) INSPIRE Year 2 (Fall Fall 2018) INSPIRE Year 3 (Fall Fall 2019) INSPIRESat-1 Schedule INSPIRESat- 1 PDR CDR Delivery Launch Operations and Science Analysis & publications 1 st INSPIRE Workshop at NCU Taiwan July 20-22, nd INSPIRE Workshop at CU Boulder August 1-3, rd INSPIRE Workshop at [TBD] July/August th INSPIRE Workshop at [TBD] July/August 2019 MOOC Development Summer Program Summer 6 credit Program Summer 6 credit Program PHD/Masters Student training under INSPIRE Project Integrate with CU Courses

7 Science Objective 1: Plasma bubbles Retterer, 2010 Plasma bubbles form around the magnetic equator in the early evening where there is a density gradient and the magnetic field lines don t extend to upper parts of the ionosphere (Kil, 2015). Bubbles propagate along magnetic field lines allowing the bubble to expand to latitudes far from their initiation site (Sultan, 1996). Bubbles can be hundreds of kilometers across (in longitude) and extend hundreds of kilometers up in altitude above the F-layer (>150 km)(kil, 2015) Bubbles can cause communications disruptions via scintillation (large drops in signal intensity and a shift in phase)

8 Science Objectives 2 and 3: the MTM Temperature Around midnight at F region heights,there is a neutral temperature increase and a characteristic wind pattern which varies in season and solar activity (see figure to the left of neutral temp as proxy for the ion temp) (Fang et al, 2016) Fang et al, 2016 Akmaev et al, 2009 Only a few models accurately capture the MTM including the coupled Whole Atmosphere Model (WAM) with the Global Ionosphere Plasmasphere (GIP) model. The MTM shows some seasonal variability in which it tends to maximize in the summer and weaken in the winter (Niranjan et al, 2006) The MTM is an understudied essential physics process that represents ion-neutral coupling

9 INSPIRESat-1 Science Data INSPIRESat-1 is targeting a km and 50 inclination non sun-synchronous orbit Passes over each grid cell at 0 Local Time over the entire 7 month mission. Assumes data will only be collected in the nighttime

10 CIP Design: Overview An In-situ Instrument for ionospheric plasma properties measurements. Verified functions with the heritage of sounding rocket in Taiwan. Previous version of CIP named AIP onboard Formosat-5 will be launched on August 24, 2017.

11 CIP Design: Overview Retarding Potential Analyzer Mode High precision of electrical mesh grids. low quasi-hysteresis effect between I- V curves measurement.

12 CIP Design Top View Front View Bottom View

13 Geophysical Data Derived from CIP PLP RPA IT IDM Orbital and Attitude Data IGRF Electron Temperature Ion Temperature Arrival Angles Ion Composition Ion Velocity in Euler Angles Coordinate Floating Potential Ion Concentratio n Ram Speed Ion Velocity in Geomagnetic Field Coordinate

14 INSPIRESat-1 Concept of Operations

15 Data Downlink in the Day CIP data Volume 12.5 MB/day (50% duty cycle, normal mode) 100 MB/day (fast mode, 50% DC) UHF Data rate 19.2 kilobits/sec S-Band rate 0.25 Megabytes/sec Gnd St Average Access Time >= 5mins (mins) UHF Data (Megabytes/day) S-Band Data (Megabytes/day) Boulder IIST NCU Total (for 6 GS)

16 LASP CubeSat Student Operations Center Legend: 1 S-band 4.2 m S-band antenna with 24 dia. Radome 2 Radome and Type 2 pedestal base mount structure 3 CubeSat Student Operations Center 4 UHF Antenna 5 UHF RF equipment rack inside building

17 INSPIRESat-1 Assembly Solar Panel UHF Antenna Depl Mod S-Band Transmitter UHF Antenna UHF Comm Module BCT XACT Battery Pack EPS Card C&DH Card CIP

18 Some Assembly Required

19 Subsystems Subsystem Strategy Delegated to Payload (CIP) Develop NCU C&DH Develop IIST FSW Develop IIST, LASP EPS Develop NCU Structure Develop LASP Communication COTS SpaceQuest TRX-U and TX-2400 S ADCS COTS BlueCanyon XACT

20 Prototyping Battery Board Assembly C&DH Board prototype vacuum testing 20 20

21 INSPIRE Summer 2017 Thank You! Questions