US 2021 Coronal Loops : Sun Science 55c. Scott. 5599


US 2021 Coronal Loops : Sun Science 55c. Scott. 5599


Series: Sun Science (2021)

Stamp details: Coronal Loops

Issued date: 18-06-2021 (dd/mm/yyyy)
Face value: 55c.
(FOREVER º - No Face Value)

Format: Pane of 20

Emission: Commemorative
First Day City: Greenbelt, Maryland

Catalogue No:-
Scott (USA): 5599
Michel (Germany): 5832BA
Yvert et Tellier (France): 5441

Designers: Antonio Alcalá

Dimensions (height x width):
31.25mm x 31.25mm

Printer: Banknote Corporation of America
Print Method: Flexographic, Foil Stamping

Perforation: Serpentine Die Cut 10¾ x 10½

Stamp Colors: Multicolored
Gum type: Self-Adhesive

Themes: Sun, Astronomy

Total print: 3,000,000 (estimate)

Note: Stamp from se-tenant block of ten.

Face value US$0.55 on day of issue.

Description:- In solar physics, a coronal loop is a well-defined arch-like structure in the Sun's atmosphere made up of relatively dense plasma confined and isolated from the surrounding medium by magnetic flux tubes. Coronal loops begin and end at two footpoints on the photosphere and project into the transition region and lower corona. They typically form and dissipate over periods of seconds to days and may span anywhere from 1 to 1,000 megametres (621 to 621,000 mi) in length. Coronal loops are often associated with the strong magnetic fields located within active regions and sunspots. The number of coronal loops varies with the 11 year solar cycle.
Source: en.wikipedia.org/wiki/Coronal_loop