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PRECIPITATION MEASUREMENT MISSIONS

Keyword: GPM Core Observatory

Article: 3D Views of February Snow Storms from GPM


Video: GPM Sees Nor'easter Dump Snow on New England


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At 5:05 p.m. EST Monday, Jan. 26, 2015, the Global Precipitation Measurement mission's Core Observatory flew over the Nor'easter that dumped snow on New England. This satellite image shows the rate of rainfall, with low amounts in green and high in red, and snowfall, in blue to purple. The center of the storm, shown in 3-D, was offshore with far reaching bands of snowfall. More intense snow rates are shown in darker blue, which can be seen on the northern edge of the storm.

Article: GPM Sees Heavy Snow Over New England


At 5:05 p.m. EST Monday, Jan. 26, 2015, the Global Precipitation Measurement mission's Core Observatory flew over the Nor'easter that dumped snow on New England. This satellite image shows the rate of rainfall, with low amounts in green and high in red, and snowfall, in blue to purple. The center of the storm, shown in 3-D, was offshore with far reaching bands of snowfall. More intense snow rates are shown in darker blue, which can be seen on the northern edge of the storm.

Article: GPM Data Goes Public


Image Credit: NASA's Goddard Space Flight Center

Mission News: Level 2 GPM Microwave Imager (GMI) Data Released


Summary: 

The Global Precipitation Measurement (GPM) mission's Precipitation Processing System at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, has released the Level 2 GPM Microwave Imager (GMI) data to the public. The data set includes precipitation rates, which show how much rain and snowfall accumulate over a given time period.

The Global Precipitation Measurement (GPM) mission's Precipitation Processing System at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, has released the Level 2 GPM Microwave Imager (GMI) data to the public. The data set includes precipitation rates, which show how much rain and snowfall accumulate over a given time period.

Mission News: GPM Performs Maneuvers, Continues Calibration


Summary: 

The GPM spacecraft continues to perform normally. The GPM Microwave Imager and Dual-frequency Precipitation radar continue operations and calibration. The spacecraft performed two routine maneuvers. The first was a 180-degree yaw (left/right in the horizontal plane) turn. This is the second yaw turn that changes the orientation of the spacecraft; it is now flying forwards again. Yaw turns are performed approximately every 40 days for thermal control, as the angle between the spacecraft's orbit and the sun changes. This keeps the side of the spacecraft designed to remain cold from overheating.

The second routine maneuver performed was a delta-v burn to increase the velocity of the spacecraft and maintain altitude. An extremely thin layer of atmosphere still exists at GPM's altitude of 250 miles above Earth's surface. As the spacecraft flies through the thin gases, drag occurs, slowing – and lowering – the spacecraft. Delta-v burns occur weekly to maintain altitude.

The GPM spacecraft continues to perform normally. The GPM Microwave Imager and Dual-frequency Precipitation radar continue operations and calibration.

Mission News: GPM Calibration Continues


Summary: 

The Global Precipitation Measurement mission's Core Observatory is performing normally. Calibration of the Dual-frequency Precipitation Radar (DPR) and GPM Microwave Imager (GMI) continued.

The Global Precipitation Measurement mission's Core Observatory is performing normally. Calibration of the Dual-frequency Precipitation Radar (DPR) and GPM Microwave Imager (GMI) continued.

Mission News: GPM in Final Orbit, DPR Calibration Continues


Summary: 

The Global Precipitation Measurement mission's Core Observatory is performing normally. On April 2, the GPM Core Observatory fired its thrusters for an 80-second delta-V burn that accelerated the spacecraft and circularized its orbit. The Core Observatory is now flying in its final orbit, 253 miles (407 kilometers) above Earth's surface.

Calibration of the Dual-frequency Precipitation Radar (DPR) and GPM Microwave Imager (GMI) continued. On March 30 and 31, additional DPR external calibrations took place using the Active Radar Calibration site in Tsukuba, Japan. For the March 31 calibration test, the Core Observatory's orientation was changed by a 90-degree turn (yaw) and a slight tilt (pitch) to provide better visibility to the ground site at Tsukuba and to better calibrate the instrument.

The Global Precipitation Measurement mission's Core Observatory is performing normally. On April 2, the GPM Core Observatory fired its thrusters for an 80-second delta-V burn that accelerated the spacecraft and circularized its orbit. The Core Observatory is now flying in its final orbit, 253 miles (407 kilometers) above Earth's surface.

Mission News: Core Observatory Commissioning Continues


Summary: 

The Global Precipitation Measurement mission's Core Observatory commissioning activities continued normally this week. Both the GPM Microwave Imager and the Dual-frequency Precipitation Radar (DPR) are collecting science data and NASA and the Japan Aerospace Exploration Agency released the first images from the instruments on March 25. The DPR's functional checkout activities and internal calibration continued. The first external calibration using the Active Radar Calibration site in Tsukuba, Japan, was performed on March 23. 

A 120-second "Delta-V" burn was successfully completed Wednesday. This burn raised the orbit apogee (highest point). Next week's burn will raise the orbit perigee (lowest point) and circularize the orbit.

The Global Precipitation Measurement mission's Core Observatory commissioning activities continued normally this week. Both the GPM Microwave Imager and the Dual-frequency Precipitation Radar (DPR) are collecting science data and NASA and the Japan Aerospace Exploration Agency released the first images from the instruments on March 25.

The DPR's functional checkout activities and internal calibration continued. The first external calibration using the Active Radar Calibration site in Tsukuba, Japan, was performed on March 23. 

Video: GPM's Stormy New View


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On March 10, the Core Observatory passed over an extra-tropical cyclone On March 10, the Core Observatory passed over an extra-tropical cyclone about 1055 miles (1700 kilometers) due east of Japan's Honshu Island. Satellite data shows the full range of precipitation in the storm. 

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