Solar cycle 16

{{Infobox Solar cycles

|cycle_num=16

|start_date=August 1923

|end_date=September 1933

|duration=10.1

|image=File:Kraus slunce 1926-01-23.jpg

|caption=Sunspot record from 23 January 1923

|max_count=130.2

|max_count_date=April 1928

|min_count=9.4

|spotless_count=568

|prev_name=Solar cycle 15

|next_name=Solar cycle 17

|prev_dates=1913–1923

|next_dates=1933–1944

}}

File:Bakelite radio.jpg transmission became common during solar cycle 16, making this the first solar cycle in which radio interference became an issue.]]

Solar cycle 16 was the sixteenth solar cycle since 1755, when extensive recording of solar sunspot activity began.{{citation|doi=10.1023/A:1014296529097|year=2002|last1=Kane|first1=R.P.|title=Some Implications Using the Group Sunspot Number Reconstruction|journal=Solar Physics|volume=205|issue=2|pages=383–401|bibcode=2002SoPh..205..383K}}{{cite web | title=The Sun: Did You Say the Sun Has Spots? | url=http://www.spacetoday.org/SolSys/Sun/Sunspots.html | publisher=Space Today Online | accessdate=12 August 2010}} The solar cycle lasted 10.1 years, beginning in August 1923 and ending in September 1933. The maximum smoothed sunspot number observed during the solar cycle was 130.2 (April 1928), and the starting minimum was 9.4.SIDC Monthly Smoothed Sunspot Number. "[http://sidc.oma.be/sunspot-data/]" During the minimum transit from solar cycle 16 to 17, there were a total of 568 days with no sunspots.Spotless Days. "[http://spaceweather.com/glossary/spotlessdays.htm?PHPSESSID=dli444kmrjgre0rjq6l86fv144]"{{cite web |url=https://science.nasa.gov/headlines/y2008/11jul_solarcycleupdate.htm|archive-url=https://web.archive.org/web/20080714032353/https://science.nasa.gov/headlines/y2008/11jul_solarcycleupdate.htm|url-status=dead|archive-date=14 July 2008|title=What's Wrong with the Sun? (Nothing)|date=11 July 2008|author=Dr. Tony Phillips|publisher=NASA}}Solaemon's Spotless Days Page. "[http://users.telenet.be/j.janssens/Spotless/Spotless.html]"

Newspaper reports during this period note effects on telegraph systems, but also (in March 1924, January 1926, October 1926, and October 1927) on radio transmission.{{Cite web|url=http://www.solarstorms.org/SRefStorms.html|title=Space Weather Newspaper Archives|first=Solar|last=Storms|date=28 July 2017|website=www.solarstorms.org}}