[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help] 

Status: Not Logged In; Sign In

Melania Trump sits down for exclusive interview: 'I want to put the record straight' "Putin has already lost" "Come out and take it, you dirty, yellow-bellied rat, or I'll give it to ya through the door!" Catherine Zeta-Jones Nude at Age 55 (Men you need your girlfriend's permission to click) CDC finally admits FLUORIDE is TOXIC to humans, especially babies, How the UK is becoming a ‘third-world’ economy Keir Starmer freebies scandal US Navy Not Ready for Prime Time New York City Education Scandal: Employees Abuse Funds Meant For Homeless Students On Personal Vacations A Look at Kamala Harris’s ‘Middle Class’ Childhood 15 Rules For Discussing Israeli Warmongering Joe Biden Says He Delegated Everything to Kamala Harris: Foreign Policy to Domestic Policy Conservative Legal Firm Investigates Tim Walzs Decades-Long Ties to China Springfield Ohio Pet Snatchers The world pleads with Israel and Hezbollah to step back from disaster: New Fronts Start Moving In Ukraine Assange to Testify Before PACE Human Rights Committee in First Appearance Since Prison Release A billboard in Texas tells people to vote Democratic, US prepares $8 billion in arms aid packages for Zelensky visit Half of all home listings now sit unsold for over 60 days, In first, Hezbollah targets Mossad HQs in Tel Aviv suburb with Qader 1 MSNBC Does Election Focus Group With Michigan Union Workers – Things Don’t Go as Planned (VIDEO) Illegal Immigrants "Renting" Smuggled Children at U.S. Border "It’s An INVASION!" - Chicago Gangs GO TO WAR Against Venezuelan 'Tren de Aragua' Members Avast AV Would Not Let Me post to Freedom Forum Freedom4um Now Has A New Server Kamala gets caught FAKING audience during event!! Maine mayor tells elderly residents to take out reverse mortgages to pay their soaring property taxes brought on by illegals Texas judge threw out prosecutions of Tren de Aragua gang members who crossed border illegally PEPE ESCOBAR & SCOTT RITTER: ISRAEL'S LEBANON WAR BACKFIRES, RUSSIA CRUSHES UKRAINE, BRICS BOMBSHELL

Science/Tech
See other Science/Tech Articles

Title: Geomagnetic data reveal unusual nature of recent solar minimum
Source: PhysOrg / AGU
URL Source: http://www.physorg.com/news/2012-03 ... veal-unusual-nature-solar.html
Published: Mar 19, 2012
Author: n/a
Post Date: 2012-03-20 14:08:38 by Prefrontal Vortex
Keywords: None
Views: 132
Comments: 1

Geomagnetic data reveal unusual nature of recent solar minimum

Since the mid-1800s, scientists have been systematically measuring changes in the Earth's magnetic field and the occurrence of geomagnetic activity. Such long- term investigation has uncovered a number of cyclical changes, including a signal associated with 27-day solar rotation.

This is most clearly seen during the declining phase and minimum of each 11-year solar cycle, when the Sun's magnetic dipole is sometimes tilted with respect to the Sun's rotational axis. With the Sun's rotation and the emission of solar wind along field lines from either end of the solar magnetic dipole, an outward propagating spiral-like pattern is formed in the solar wind and the interplanetary magnetic field that can drive 27-day, and occasionally 13.5-day, recurrent geomagnetic activity.

Recurrent geomagnetic activity can also be driven by isolated and semipersistent coronal holes, from which concentrated streams of solar wind can be emitted.

During the most recent solar minimum, which took place from 2006 to 2010, however, several researcher groups noticed 6.7-day and 9-day recurrent changes in geomagnetic activity, and similar patterns in the interplanetary magnetic field, and the solar wind. Using modern data covering the previous two solar minima, these higher-frequency occurrences were judged to be unusual.

Love et al. analyzed historical geomagnetic activity records from 1868 to 2011 and find that the 6.7-day and 9-day recurrent changes were actually unique in the past 140 years.

They suggest that the higher-frequency changes in geomagnetic activity are due to an unusual transient asymmetry in the solar dynamo, the turbulent, rotating plasma deep within the sun which generates the magnetic field.

More information: Geomagnetic detection of the sectorial solar magnetic field and the historical peculiarity of minimum 23-24 Geophysical Research Letters, doi:10.1029/2011GL050702 , 2012

Provided by American Geophysical Union

Post Comment   Private Reply   Ignore Thread  

#1. To: Prefrontal Vortex, *Agriculture-Environment* (#0)

ping

free and legal online poker site click here

freepatriot32  posted on  2012-03-20   14:26:21 ET  Reply   Trace   Private Reply  

[Home]  [Headlines]  [Latest Articles]  [Latest Comments]  [Post]  [Sign-in]  [Mail]  [Setup]  [Help]