July 2, 2018 - China Launches New Weather Observation Satellite

On June 5, 2018, China launched the Fengyun-2H weather satellite aboard a Long March-3A rocket from Xichang Satellite Launch Center. It reached a geostationary orbit at 79°E, filling a critical gap in weather monitoring over the Indian Ocean, Arabian Sea, and Bay of Bengal. You're looking at a satellite that tracks typhoons, monitors dust storms, and serves over 121 countries. There's much more to uncover about what makes this mission so impactful.

Key Takeaways

• China launched the Fengyun-2H weather satellite on June 5, 2018, aboard a Long March-3A rocket from Xichang Satellite Launch Center.
• The satellite was built by Shanghai Academy of Spaceflight Technology and carries a Stretched Visible and Infrared Spin Scan Radiometer.
• Fengyun-2H was positioned at 79°E geostationary orbit, filling a coverage gap over the Indian Ocean and Arabian Sea.
• The satellite provides six-minute typhoon imaging, full-disk cloud images, and real-time data to Asia-Pacific meteorological users.
• After a four-month checkout period, Fengyun-2H entered operational service in January 2019, targeting a four-plus year mission.

What Is the Fengyun-2H Weather Satellite?

The Fengyun-2H is China's eighth and final satellite in the Fengyun-2 series, a spin-stabilized geostationary weather satellite developed by the Shanghai Academy of Spaceflight Technology under the China Aerospace Science and Technology Corporation (CASC). Launched on June 5, 2018, it's operated by China's Meteorological Administration and positioned at roughly 81° East longitude in geostationary orbit.

The satellite's instrumentation includes a Stretched Visible and Infrared Spin Scan Radiometer (S-VISSR), a Space Environment Monitor, a Solar X-ray Monitor, and a Data Collection Service. These tools enable continuous regional weather observation and space environment tracking. For data reception, you can access its transmissions internationally, as it openly broadcasts both high-resolution digital imagery and low-resolution WEFAX analogue data to user stations worldwide.

Development of the Fengyun-2 series began in the 1980s, reflecting China's long-term commitment to building an independent meteorological satellite infrastructure under CASC. Much like the modular philosophy behind commercial space stations, where reconfigurable docking ports allow for sequential additions and expanded capability, China's meteorological satellite program has itself evolved through progressively more capable generations of spacecraft. Today, real-time tracking of Fengyun-2H and tens of thousands of other objects in orbit can be monitored through services like N2YO.com, which currently tracks over 34,000 objects.

What Is the Long March-3A Rocket?

Launching the Fengyun-2H into geostationary orbit was China's Long March-3A, a three-stage rocket manufactured by the China Academy of Launch Vehicle Technology (CALT). Standing 52.52 meters tall with a launch mass of 241 tons, it generates 2,962 kN of liftoff thrust. Its first two stages derive from the Long March 2C, while the third stage runs on liquid hydrogen/liquid oxygen propellants, powering a re-ignition-capable YF-75 engine. This launch mechanics setup supports GTO payload integration of up to 2,700 kg.

Operating exclusively from Xichang Satellite Launch Center, the rocket's maintained a 100% success rate since its 1994 debut. By July 2018, it had completed 27 flights, primarily delivering heavy communication satellites to geostationary transfer orbit. The rocket has drawn criticism for dropping rocket boosters on populated areas during its missions, though the government maintains that these areas are evacuated prior to each flight. In recognition of its reliability and mature inherited technology, CASC awarded the Long March-3A the Golden Brand Launch Vehicle title in July 2007. As the commercial space sector expands, the broader shift toward private orbital operations reflects a growing global competition to develop cost-effective and commercially driven launch and station capabilities.

How Did the Fengyun-2H Launch Unfold on June 5, 2018?

On June 5, 2018, China's Long March-3A rocket lifted off from Xichang Satellite Launch Center in Sichuan Province at 9:07 p.m. Beijing Time, or 13:07 UTC.

Following the launch timeline, the rocket's upper stage released the Fengyun-2H into an elliptical transfer orbit after payload separation. The satellite reached a transfer orbit with an apogee of 35,897 kilometers and a perigee of 233 kilometers, inclined at 24.6 degrees to the equator. China's Academy of Launch Vehicle Technology confirmed successful insertion shortly after.

You can think of this orbit as a stepping stone toward the satellite's final geostationary position at 79°E. This adjusted orbital position was chosen in response to requests from the WMO and APSCO, enabling coverage of Belt and Road countries as well as the Indian Ocean and most African countries.

Before entering operational service, Fengyun-2H underwent a four-month post-launch checkout period to verify its scanning radiometer and space environment monitor functioned correctly. The spent rocket stage, known as the Fengyun 2H AKM, remained in orbit following separation, where it continues to pose long-term collision hazards to other satellites and space infrastructure.

What Orbit Did Fengyun-2H Enter and Why Does It Matter?

After separation from the Long March-3A rocket, Fengyun-2H entered an elliptical transfer orbit with a perigee of 233 kilometers and an apogee of 35,897 kilometers, inclined 24.6 degrees to the equator.

Its onboard engine then executed burns to circularize the orbit, demonstrating fundamental orbital mechanics. This approach to reliable data transmission mirrors early innovations like packet switching technology, which also prioritized resilient, uninterrupted communication across distributed networks.

The final geostationary position delivers four critical advantages:

1. Fixed coverage over the Indian Ocean, Africa, and Central Asia
2. Six-minute typhoon imaging for rapid storm response
3. Stable positioning at 79°E longitude, matching Earth's rotation
4. Data sharing with NOAA and EUMETSAT partners

You can appreciate how precise orbital placement directly supports Fengyun-2H's mission duration goal of four-plus operational years.

Its spin-stabilization at 100 RPM maintains attitude control throughout that service life. The satellite was built by the Shanghai Institute of Satellite Engineering, which has overseen development of the FY-2 program since it began in 1980. Fengyun-2H is the eighth and final satellite of the Fengyun 2 series, which has been active since 1997.

Which Countries Fall Under Fengyun-2H Coverage?

Fengyun-2H's fixed position at 79°E longitude isn't just a technical achievement—it's what determines who benefits from the satellite's weather data. From this vantage point, the satellite achieves full regional coverage of China's entire territory while simultaneously serving Belt and Road Initiative participating nations across Central Asia, the Middle East, and the Indian Ocean region.

China's data sharing agreements extend well beyond immediate neighbors. You'll find authorized Fengyun Emergency Support Mechanism users across Southeast Asia—Laos, Myanmar, Thailand, the Philippines, and Malaysia—alongside Middle Eastern nations like Iran and North African countries including Algeria and Tunisia. Maldives and Uzbekistan round out the beneficiary list. China offers Fengyun series data free of charge to Belt and Road countries, making practical meteorological support accessible to nations that might otherwise lack reliable forecasting resources. To further strengthen this support, China has established ground stations in select APSCO member countries, including Pakistan, Indonesia, Thailand, Iran, and Mongolia, with plans to upgrade these stations and provide technician training in recipient nations.

The Emergency Support Mechanism has proven highly active, having been initiated more than 20 times in a single year to assist countries such as Sri Lanka, Bangladesh, Myanmar, and Nepal in responding to natural disasters. Canada's experience operating the Eureka Weather Station on Ellesmere Island since 1947 demonstrates how sustained, long-term meteorological monitoring in remote and extreme environments can meaningfully improve understanding of regional and global climate patterns.

Why the 79°E Position Fills a Critical Gap

Before Fengyun-2H arrived at 79°E, a meaningful gap existed in geostationary coverage across the Indian Ocean, Arabian Sea, and Bay of Bengal. Neighboring satellites like India's Insat and Japan's Himawari left this longitude chronically underserved, weakening maritime surveillance and slowing data assimilation into global forecast models.

Here's why 79°E matters:

1. Cyclone tracking — You get persistent monitoring over North Indian Ocean genesis zones.
2. Monsoon coverage — Active convection over Bangladesh, Myanmar, and Thailand stays visible in near real-time.
3. Model improvement — Atmospheric soundings fill a data-sparse sector, sharpening numerical weather prediction inputs.
4. Imagery continuity — 15-minute rapid scans eliminate blind spots between previously neighboring GEO satellites.

This position turns a chronic weakness into a functional strength for Asia-Pacific forecasters. Polar-orbiting satellites provide the majority of data fed into computer models for weather forecasting, and without continuous satellite data coverage, even well-positioned geostationary assets cannot fully compensate for gaps in medium-range forecast skill. Canada's Anik A1 demonstrated as early as 1974 that a single geostationary platform could deliver continent-wide real-time communications to remote and underserved communities, establishing a precedent that shaped beam coverage could be deliberately engineered to target geographic gaps rather than simply maximize population reach. Complementing geostationary assets with low-cost SmallSat constellations could further strengthen regional coverage, as WMO space weather requirements highlight that existing satellite networks often poorly meet near-real-time operational standards.

How Fengyun-2H Tracks Typhoons and Extreme Weather

When a typhoon spins up over the Western Pacific, Fengyun-2H's S-VISSR radiometer kicks in with six-minute sub-regional scans that capture the storm's cloud structure, eye formation, and intensity shifts in near real-time. Its infrared tracking channels let you monitor cloud patterns even when visible light fails, giving forecasters a continuous view of storm evolution day and night.

Rapid imaging doesn't stop at typhoons. You get sand and dust monitoring, rainstorm tracking, forest fire detection, and Cloud Motion Winds that map wind field distribution across vast regions. The satellite also feeds data directly into global numerical weather prediction models, sharpening forecast accuracy. Combined with spatial resolutions as fine as 500 meters on related FY-4 series sensors, Fengyun-2H delivers the detail disaster managers need to act fast. Positioned at 79 degrees East, the satellite maintains a fixed view over China's territory, the South China Sea, and the Indian Ocean, ensuring continuous coverage of the region's most typhoon-prone areas. Much like geostationary orbit enables three evenly-spaced satellites to cover the entire globe continuously, Fengyun-2H's fixed position allows it to deliver uninterrupted regional observation without the coverage gaps that plague lower-orbit systems.

Beyond regional coverage, Fengyun-2H plays a critical role in international disaster response, with countries along the Belt and Road able to apply through the Emergency Support Mechanism for dedicated satellite observations during major disaster events.

How Fengyun-2H Serves Belt and Road Weather Monitoring

Positioned at 79°E longitude at the request of WMO and APSCO, Fengyun-2H pulls in coverage across all Chinese territory, Belt and Road countries, the Indian Ocean, and most of Africa—filling blind spots that left global meteorological networks incomplete.

As the designated Belt Road satellite, it serves users across 121 countries and regions, supporting critical needs through Satellite Training and direct data access.

Here's what it delivers daily:

1. 28 full-disk cloud images and 20 northern hemisphere images
2. Real-time water vapor and space weather data to Asia-Pacific clients
3. Emergency disaster data for authorities across Africa, Middle East, and Central/South Asia
4. Enhanced six-minute imaging of localized weather systems across BRI regions

You're looking at a satellite built to close coverage gaps where they matter most. Since becoming operational in January 2019, Fengyun-2H has produced ~55,000 cloud images in total, building a substantial archive that supports ongoing weather analysis and disaster response worldwide. In February 2022, Fengyun-2H was officially recognized as an on-duty CHARTER satellite, enabling it to provide structured international data services to countries vulnerable to meteorological disasters.

How Does Fengyun-2H Compare to the Fengyun-4 Generation?

While Fengyun-2H marks the end of China's first-generation spin-stabilized satellite line, Fengyun-4A represents a full generational leap—heavier, longer-lived, and packed with instrumentation that makes direct comparison difficult.

You're looking at a satellite nearly four times heavier, with a design life exceeding seven years versus FY-2H's four-year minimum. FY-4A's three-axis stabilization enables faster, sharper imaging—full disk coverage every 15 minutes compared to FY-2H's 30.

Its AGRI, GIIRS, and Lightning Mapping Imager reflect advances in instrument miniaturization, allowing more capability within a coherent platform. FY-4A's data fusion potential, combining atmospheric sounding, lightning detection, and high-resolution imaging simultaneously, simply isn't something FY-2H can match.

Both satellites serve China's meteorological network, but they're operating in fundamentally different technological eras. Much like the Silver Dart's first flight demonstrated the viability of powered aviation in Canada in 1909, each new generation of weather satellites marks a foundational moment that reshapes what becomes possible in the field that follows.

How Fengyun-4 Is Replacing the Fengyun-2 Series

China's transition from the Fengyun-2 to the Fengyun-4 series didn't happen overnight—it unfolded across years of overlapping operations as newer satellites gradually took over GEO coverage.

You can see this satellite decommissioning strategy and data continuity planning reflected in four key milestones:

1. FY-2F retired following AOMSUC-11
2. FY-4B recruited post-AOMSUC-11, entering trial operation June 1, 2022
3. FY-4C launched in 2023, positioned above New Guinea, replacing FY-4A with an 8-year operational plan
4. FY-2H remains the final active FY-2 unit at 79°E, providing 30-minute full-disk scans until FY-4 fully assumes GEO coverage

This phased approach ensured uninterrupted meteorological data while China systematically upgraded its observational capabilities. Fengyun-4C is the 3rd geostationary satellite in the Fengyun-4 series, continuing a lineage of Chinese meteorological spacecraft that stretches back to September 1988. The FY-2 series itself began with the launch of FY-2A on June 10, 1997, marking the start of China's geostationary meteorological satellite era. Much like how weather satellites enable precise atmospheric monitoring from orbit, ground-based scientific breakthroughs such as the first laser—demonstrated using stimulated optical radiation in a ruby crystal—have similarly expanded humanity's ability to measure and observe the natural world with unprecedented accuracy.