Connect launches to public services

The launch photograph shows H-IIA Flight 25 carrying Himawari-8 on October 7, 2014. Delivering a weather satellite enables a later chain of observations, data processing and interpretation. The rocket does not itself make the forecast, and a launch photograph cannot establish that a sensor has been calibrated.

JMA describes Himawari-8/9 full-disk observations at ten-minute intervals, with more frequent regional views. Repeated observations let forecasters follow changing cloud systems rather than rely on a single snapshot. Satellite data support weather analysis and numerical prediction alongside other observations and models.

In an original idealized exercise, images at 00, 10, 20 and 30 minutes provide three ten-minute gaps between four observations. Comparing the first and last image gives a thirty-minute interval. Confusing the number of images with the number of gaps would overstate the elapsed time.

A shorter interval can reveal changes sooner, but frequency alone does not establish a better measurement. Spatial detail, spectral information, calibration, missing observations and processing delays also matter. A complete service needs a reliable way to get interpreted information to the people who use it.

The final H-IIA flight was Flight 50 on June 29, 2025, carrying GOSAT-GW. JAXA’s July report separated launch success from later spacecraft checks: the critical phase ended on July 1, followed by initial functional verification. These dates describe different milestones, not interchangeable names for one event.

H-IIA is now a retired launch program. Its older project page retains present-tense wording from the operational era, so this course uses the dated final-flight account to establish retirement. Satellites delivered by a retired launcher can continue their own missions. H3’s continuing development belongs in the separate H3 course rather than being counted as additional H-IIA flights.