Local Noon imagery near the Equinox

September 19th, 2021 |
Multi-satellite True-Color imagery at local noon, 19 September 2021 (Click to enlarge)

SSEC/CIMSS scientists (notably Rick Kohrs) create daily imagery that blends vertical strips of true-color imagery at local Noon, starting near the dateline and proceeding westward. A year-long animation of this product is available here, and was discussed on this blog previously here (and here). Recent images are available at this website — the imagery there, like that above, has a size of 1440×720 pixels. Full-size imagery (9200×4600 pixels) are available for purchase at the website.

The image above, from shortly before the (Northern Hemisphere) Autumnal Equinox shows illumination at both Poles. Careful inspection of the imagery does reveal difference between imagery created from Himawari-8 Imagery over eastern Asia and imagery created from Meteosat imagery over central Asia. There is a more subtle difference between Meteosat imagery and GOES-16 imagery, chiefly because that seam is over the eastern Atlantic Ocean. Such differences arise from spectral differences between the satellites.

This web page with web apps allows anyone to investigate how solar energy varies with the season.

Eruption of the Cumbre Vieja volcano on La Palma in the Canary Islands

September 19th, 2021 |

GOES-16 True Color RGB images [click to play animation | MP4]

GOES-16 (GOES-East) True Color RGB images created using Geo2Grid (above) showed the southward expansion of a volcanic cloud following an eruption of Cumbre Vieja in the Canary Islands at 1410 UTC (advisories) on 19 September 2021. The eruption caused some evacuations on the island of La Palma. The ash loading was relatively light, as no distinct ash signature (shades of pink to magenta) was seen the corresponding GOES-16 Ash RGB  images (animated GIF | MP4) — however, pale shades of green in those RGB images did suggest the presence of SO2 within the volcanic cloud (below). Lower-altitude winds transported some of the volcanic cloud material southwestward, while higher-altitude winds carried SO2-rich parts of the volcanic cloud toward the southeast (Tenerife, Canary Islands sounding).

GOES-16 True Color RGB and Ash RGB images at 1700 UTC [click to enlarge]

A distinct thermal anomaly (cluster of hot pixels, yellow to red enhancement) was seen at the eruption site on GOES-16 Shortwave Infrared (3.9 µm) images (below) — this thermal signature briefly subsided about 2 hours after the eruption, but then resumed for several additional hours. The bulk of any significant volcanic ash remained aloft, with no restrictions to surface visibility reported at La Palma or Tenerife.

GOES-16 Shortwave Infrared (3.9 µm) images [click to play animation | MP4]