• Email Us: [email protected]
  • Contact Us: +1 718 874 1545
  • Skip to main content
  • Skip to primary sidebar

Medical Market Report

  • Home
  • All Reports
  • About Us
  • Contact Us

Watch Out For Auroras Caused By Flares From A Backwards Sunspot

May 9, 2023 by Deborah Bloomfield

A reverse-polarity sunspot has released a solar flare expected to trigger a moderate to strong geomagnetic storm on Earth either tonight or tomorrow. People in the right locations could get another treat similar to the auroras of late February and March 23. For those suitably minded, there would also be the intellectual thrill of knowing that what they are seeing comes from a rare class of sunspots.

On Sunday evening UTC, an M1.5 solar flare was reported by Spaceweather.com. By Monday morning, American time, Space Weather Watch was announcing an accompanying coronal mass ejection (CME). Both flares and CMEs, which often occur together, can trigger geomagnetic storms when high-energy photons or charged particles encounter the Earth’s upper atmosphere.

Advertisement

Nevertheless, at first sight, this event might not seem like one that would cause much excitement. M-class is only the second largest class of flares, after X, and with a scale that goes up to M10, 1.5 is pretty modest. Three years ago, in the depths of the solar quiet, this would have been big news, but the last few months have seen flares more than 10 times as large.

However, while it never got that big, the flare was unusually long, lasting six hours. More importantly, the CME appears to be headed straight for Earth. A direct hit from a small CME can cause more auroral activity than a glancing blow from something larger.

Knowing that a CME is likely to hit Earth’s magnetosphere, and knowing when it will occur are different things, however. This aurora is estimated to be streaming toward Earth at a speed somewhere between 700 and 1,100 kilometers per second (1.6 million – 2.5 million miles per hour). With a distance of 150 million kilometers (93 million miles) to cover, the difference between being top and bottom of that range makes for a gap in arrival time of more than a day. If the resulting auroras only last a few hours, that will determine which parts of the planet have auroras during daylight when no one can see them.

ⓘ IFLScience is not responsible for content shared from external sites.

Advertisement

The National Oceanic and Atmospheric Administration aurora dashboard currently predicts mild storm activity from 11 pm-3 am Wednesday night/Thursday morning UTC. “With a chance of isolated G2 (moderate) storms and a slight chance of G3 (strong)”, this would make for optimum viewing times in North America, but predictions of events like these still carry plenty of uncertainty.

If an aurora does occur, observers will have something special to add to the memory. Sunspots all have bipolar magnetic fields. As far back as 1909, George Hale noticed that the sunspots in one hemisphere usually have the same polarity – at the time all those in the Northern Hemisphere had their north pole leading and the south pole trailing, while the opposite was true in the Southern Hemisphere. At the end of an 11-year sunspot cycle, the polarities between the hemispheres swapped, and have done so between every cycle since.

A small minority (around 3 percent) of sunspots show reverse polarity, with their fields in the opposite direction to others in their hemisphere. Some observers claim these Hale’s law violators are usually small and weak, but others dispute this. Certainly, the sunspot region known as AR3296 is large and powerful. Its negative polarity is on the right in standard orientation images from Earth, in contrast to all those around it. Reverse polarity sunspots more often develop tangled magnetic fields, leading to an increased chance of explosions such as the one heading our way. 

Deborah Bloomfield
Deborah Bloomfield

Related posts:

  1. Kroger expects smaller decline in same-store sales on grocery demand
  2. Libya presidency council head plans to hold October conference
  3. Tikehau Capital aims for around 5 billion euros of assets dedicated to tackling climate change
  4. Think Your Country Is Hot On Abortion Rights? Think Again

Source Link: Watch Out For Auroras Caused By Flares From A Backwards Sunspot

Filed Under: News

Primary Sidebar

  • “Nobody Expected This”: Earth’s Rotation Will Speed Up In July And August, Bucking The Downward Trend
  • What Is The “Heat Dome” Causing Baking Temperatures In The Eastern US This June?
  • Over 500 Bird Species At Risk In Next Century As We Face “Unprecedented” Extinction Crisis
  • World First: Mice With 2 Dads Father Their Own Offspring
  • Largest Ever Space-Based Gravitational Wave Observatory Begins Construction
  • Plastic Trash? This Bacterium Can Turn It Into Paracetamol – AKA Tylenol®
  • What Is The Earliest Evidence For Blue Eyes In Humans?
  • Now 124 Years Old, Henry Is The World’s Oldest Known Crocodile – And He’s A Big Boy
  • What Happened When A Kansas Family Lived With 2,055 Brown Recluse Spiders For 5 And A Half Years
  • The Last Thing A NASA Spacecraft Saw Before Plunging Into Saturn
  • Neolithic Ireland Wasn’t Ruled By Incestuous “God-Kings” After All
  • NASA’s Voyager 1 & 2 Were Not The First Missions To Reach The Outer Solar System
  • See Incredible First Images From Space Mission That Will Weigh All The World’s Forests
  • Nudes Of The Stone Age: 6,000-Year-Old Kołobrzeg Venus Is A Prehistoric Masterpiece
  • Cannabis And Human Remains Sent To Space Go Missing After Returning To Earth On SpaceX Mission
  • Mercury’s Steep Cliffs Might Be The Result Of The Sun Squeezing The Planet
  • Dennis Hope: The Man Who Allegedly Sold Presidents Land On The Moon (That He Doesn’t Own)
  • Video: Which Animal Has The Largest Brain?
  • Amazing First Images From World’s Largest Digital Camera Revealed
  • There’s Only One Person In The World With This Blood Type
  • Business
  • Health
  • News
  • Science
  • Technology
  • +1 718 874 1545
  • +91 78878 22626
  • [email protected]
Office Address
Prudour Pvt. Ltd. 420 Lexington Avenue Suite 300 New York City, NY 10170.

Powered by Prudour Network

Copyrights © 2025 · Medical Market Report. All Rights Reserved.

Go to mobile version