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Author Topic: Reverse-Polarity Sunspot Group Does Not Belong to Cycle 25, Observatory Says  (Read 117 times)

Offline ChrisSmolinski

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The Royal Observatory of Belgium’s Solar-Terrestrial Centre of Excellence (STCE) has asserted that the reverse polarity sunspot group 2720 observed in late August belongs to the current solar cycle — Cycle 24 — and does not represent the start of Cycle 25.

“Because of its reversed polarity, some websites claimed sunspot group 2720 was possibly one of the first groups of new solar Cycle 25,” the Centre said. “This is simply not true, in view of its very low 8° latitude. The next solar Cycle 25 sunspot group should have both reversed magnetic polarity and much higher heliographic latitude, typically 20° to 40° from the equator. Only two tiny, short-lived numbered sunspot groups are currently assigned to new solar Cycle 25, sunspot group 2620 in December 2016 and 2694 in January 2018.”

http://www.arrl.org/news/reverse-polarity-sunspot-group-does-not-belong-to-cycle-25-observatory-says
Chris Smolinski
Westminster, MD
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NRD 545 / netSDR / AFE822x / AirSpy HF+ / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Offline skeezix

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The same weekend of sunspot group 2720, a radio blackout lasting about a day took place, affecting the HF amateur bands as well as GPS systems

Guess that's why I had problems acquiring GPS satellites on my phone and marine HT back then. Thought it was just my stupid phone being stupid.

LORAN-C ... how I miss you.  :'(
 
« Last Edit: September 09, 2018, 2248 UTC by skeezix »
Minneapolis, MN

Offline ChrisSmolinski

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The same weekend of sunspot group 2720, a radio blackout lasting about a day took place, affecting the HF amateur bands as well as GPS systems

Guess that's why I had problems acquiring GPS satellites on my phone and marine HT back then. Thought it was just my stupid phone being stupid.

LORAN-C ... how I miss you.  :'(


You need one of the Android phones with built in LORAN:

Chris Smolinski
Westminster, MD
eQSLs appreciated! Send to: csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop