Featured Research

from universities, journals, and other organizations

Whole Sun Month At Solar Minimum: Results Of A Worldwide Study

Date:
May 11, 1999
Source:
American Geophysical Union
Summary:
Scientists have completed a comprehensive study of the Sun during a month of its most recent quiet period, using instruments not previously available. They have compiled data and gained insights that will be useful as the Sun reaches its period of maximum sunspot activity in the year 2000.

WASHINGTON, D.C. -- Scientists have completed a comprehensive study of the Sun during a month of its most recent quiet period, using instruments not previously available. They have compiled data and gained insights that will be useful as the Sun reaches its period of maximum sunspot activity in the year 2000.

Related Articles


Whole Sun Month was a two-year collaborative effort of the Inter-Agency Consultative Group (IACG) Campaign 4 and the Solar and Heliospheric Observatory (SOHO) Working Group Joint Observing Program 44. Under its auspices, an international and interdisciplinary group of scientists studied the Sun from August 8 to September 10, 1996, a period known as solar minimum. Although two workshops have been devoted to Whole Sun Month (WSM) and some results have been reported at meetings of the American Geophysical Union and other organizations and in some journal articles, the first comprehensive, peer reviewed compilation appears in the current issue of the Journal of Geophysical Research.

The Sun exhibits an approximately eleven year cycle of sunspots, with a shorter period from minimum to maximum than for maximum back to minimum. At solar minimum, there are few sunspots and related magnetic activity, such as solar wind. In their introduction to the 237 page special section on WSM, Antoinette B. Galvin of the University of New Hampshire and John L. Kohl of the Harvard-Smithsonian Center for Astrophysics state that the project's objective was to gain an understanding of the large-scale, stable structures that dominate the solar corona at solar minimum.

The corona is the outermost layer of the solar atmosphere, and Galvin and Kohl say that understanding the large-scale corona is fundamental to understanding how and where the solar wind is accelerated. The solar wind, an outflow of particles and magnetic fields, can affect communications on Earth, especially during the solar maximum.

The 19 papers in the JGR special section are divided into four major areas of investigation:

* Global Morphology. This section includes the largest variety of synoptic maps of the Sun ever published in a single paper.

* Structure and Physical Properties of the Corona. This section describes determinations of the density and structure of the corona, essential for understanding and modeling the formation of the solar wind.

* Structure and Physical Properties of the "Elephant's Trunk." This was an unusual, elongated coronal hole that appeared during the study period.

* In Situ Observations. Observations were not limited to the Sun itself; this section analyzes the effect of solar minimum at the Earth and up to 4.3 times the distance of the Earth from the Sun.

Funding for the Whole Sun Month study was provided by NASA, the United Kingdom PPARC, National Science Foundation, European Space Agency, and other agencies.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Cite This Page:

American Geophysical Union. "Whole Sun Month At Solar Minimum: Results Of A Worldwide Study." ScienceDaily. ScienceDaily, 11 May 1999. <www.sciencedaily.com/releases/1999/05/990511075321.htm>.
American Geophysical Union. (1999, May 11). Whole Sun Month At Solar Minimum: Results Of A Worldwide Study. ScienceDaily. Retrieved April 1, 2015 from www.sciencedaily.com/releases/1999/05/990511075321.htm
American Geophysical Union. "Whole Sun Month At Solar Minimum: Results Of A Worldwide Study." ScienceDaily. www.sciencedaily.com/releases/1999/05/990511075321.htm (accessed April 1, 2015).

Share This


More From ScienceDaily



More Space & Time News

Wednesday, April 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Universe Could Be Full Of Tatooine Sunsets

The Universe Could Be Full Of Tatooine Sunsets

Newsy (Mar. 30, 2015) University of Utah researchers say mathematical simulations show small, rocky planets, like Tatooine from "Star Wars," can form in dual-star systems. Video provided by Newsy
Powered by NewsLook.com
What NASA Wants To Learn From Its 'Year In Space' Tests

What NASA Wants To Learn From Its 'Year In Space' Tests

Newsy (Mar. 28, 2015) Astronaut Scott Kelly and cosmonaut Mikhail Kornienko will spend a year in space running tests on human physiology and psychology. Video provided by Newsy
Powered by NewsLook.com
Raw: Astronauts Arrive at ISS for 1-Year Mission

Raw: Astronauts Arrive at ISS for 1-Year Mission

AP (Mar. 28, 2015) The capsule carrying a Russian and an American who are to spend a year away from Earth docked Saturday with the International Space Station. (March 28) Video provided by AP
Powered by NewsLook.com
Crew Starts One-Year Space Mission

Crew Starts One-Year Space Mission

Reuters - News Video Online (Mar. 28, 2015) Russian-U.S. crew arrives safely at the International Space Station for the start of a ground-breaking year-long stay. Paul Chapman reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins