VOYAGER-SOW.docx

VOYAGER-SOW-002018

Revision B Effective Date: October 1, 2021 Expiration Date: September 30, 2024

Voyager Magnetometer Data Processing and Analysis Statement of Work

Signature Page

Prepared by:

Voyager Magnetometer Data Manager/ Technical Representative GSFC/NASA, Code 672

Approved by:

Dr. Antti Pulkkinen Date Director, Heliophysics Division GSFC/NASA, Code 670

TABEL OF CONTENT

1.0 INTRODUCTION

1.1 BACKGROUND

The NASA Voyager 1 and 2 spacecraft were launched in 1977 on a mission to explore the outer gas giant planets. After Voyager 2 passed by the Neptune system in 1989, the twin spacecraft were recommissioned to study the outer reaches of our heliosphere and the local interstellar medium, called the Voyager Interstellar Mission (VIM). Voyager 1 crossed the heliopause, the outer boundary of the heliosphere in 2012 entering into the local interstellar medium for the first time. Voyager 2 is expected to reach interstellar space in the next couple of years. Both spacecraft are expected to operate at least till 2024.

Each Voyager spacecraft carries two fluxgate magnetometers on a 13 m boom to measure the ambient magnetic field vectors. Since the magnetometers were optimized for the large fields of the outer planets, calibrating the instruments for the very small outer heliospheric and interstellar fields is a very complex process. The calibration procedure, developed over the past two decades, relies on occasional spacecraft rolls and an internal electronic magcal process. In addition, the measurements obtained by the two magnetometers are compared, and spacecraft induced noises are eliminated. The data validation process for the magnetometers has been developed and is being executed by Dr. Leonard Burlaga. This contract is for the continued execution of this magnetometer calibration process for the next year, with an option for two additional years.

1.2 SCOPE

· Contractor shall deliver fully calibrated Voyager 1 and Voyager 2 48-second magnetic field data to the NASA Space Physics Data Facility (SPDF).

· Contractor shall deliver fully calibrated Voyager 1 and Voyager 2 1-hour average magnetic field data for submission to COHOWeb.

· Contractor shall validate the Voyager 1 and 2 magnetic field data by performing science research with it that result in at least one, first-authored, peer-reviewed science publication.

· Contractor shall provide expert technical consultation to support the NASA/GSFC Voyager magnetometer team by attending science team meetings.

1.3 REQUIREMENTS

· The fully calibrated Voyager 1 and 2 magnetic field data shall incorporate the spacecraft magroll maneuvers, instrument magcal results, and comparison of the inboard and outboard magnetometer measurements. Spacecraft induced data spikes and offsets shall be removed from the data set.

· The science research performed with the Voyager 1 and 2 magnetic field data shall demonstrate and validate that the measurements are consistent with the inner and outer heliosheath environment the spacecraft are currently traversing. The results shall be documented in at least one first authored scientific publication.

· Expert consultation shall include, but not limited to, expert advice on the proper processing of the voyager 1 and 2 magnetic field data during long durations of no spacecraft roll maneuvers.

2.0 DELIVERABLE OR DELIVERY SCHEDULE

· The above described Voyager 1 and 2 magnetic field data products are due to the NASA/GSFC Voyager magnetometer team, and to the NASA/GSFC SPDF and COHOWeb.

· Delivery schedule

· 48-second and 1-hour averaged calibrated magnetometer data: 90 days after the award and every 90 days past it.

· Science publication: 1 year from award.

· The delivered data products shall be in ASCII data format.

· Quarterly technical status reports are also required.

3.0 GOVERNMENT-FURNISHED EQUIPMENT AND GOVERNMENT-FURNISHED INFORMATION

· There will be no Government-furnished equipment (GFE).

· The government will provide VOYAGER 1 and 2 magnetometer telemetry data and necessary housekeeping and calibration information.

4.0 PLACE OF PERFORMANCE

The work shall be performed at the contractor’s site.

5.0 PERIOD OF PERFORMANCE

The period of performance is from the award of this contract to 1-year past, with an optional 2nd and 3rd years of performance provided that the spacecraft are still returning data.