The Vertical Structure of Dynamo Winds Deduced from Geomagnetic Variations Associated with Solar Flares

by Stanley Marshall Greenfield, S. V. Venkateswaran

Purchase Print Copy

 FormatList Price Price
Add to Cart Paperback29 pages $20.00 $16.00 20% Web Discount

A detailed time analysis of the massive solar flare that occurred at 1522 UT on 28 August 1966 and a study of its implications for the large-scale wind system in the 90-140 km dynamo region of the atmosphere. Equivalent ionospheric current maps for the flare-produced part of the magnetic variation were constructed to cover every 2.5 minutes from 1522 to 1602 UT. Results support the assumption that the massive X-ray output was at first mainly in the longer wavelengths which were absorbed in the lower E or F regions. The X-radiation became progressively harder as the flare reached maximum, then softened. Analysis of the sequence of observed sudden ionospheric disturbances indicates the existence of vertical variation in the global wind systems in the dynamo region, resulting in a reversal of current in the upper part of the region.

This report is part of the RAND Corporation Paper series. The paper was a product of the RAND Corporation from 1948 to 2003 that captured speeches, memorials, and derivative research, usually prepared on authors' own time and meant to be the scholarly or scientific contribution of individual authors to their professional fields. Papers were less formal than reports and did not require rigorous peer review.

Our mission to help improve policy and decisionmaking through research and analysis is enabled through our core values of quality and objectivity and our unwavering commitment to the highest level of integrity and ethical behavior. To help ensure our research and analysis are rigorous, objective, and nonpartisan, we subject our research publications to a robust and exacting quality-assurance process; avoid both the appearance and reality of financial and other conflicts of interest through staff training, project screening, and a policy of mandatory disclosure; and pursue transparency in our research engagements through our commitment to the open publication of our research findings and recommendations, disclosure of the source of funding of published research, and policies to ensure intellectual independence. For more information, visit www.rand.org/about/principles.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.