Accession Number:

ADA537540

Title:

The Progress of Solar Cycle 24 at High Latitudes

Descriptive Note:

Electronic preprint

Corporate Author:

AIR FORCE GEOPHYSICS LAB SUNSPOT NM SOLAR RESEARCH BRANCH

Personal Author(s):

Report Date:

2009-09-01

Pagination or Media Count:

7.0

Abstract:

The extended solar cycle 24 began in 1999 near 70 degrees latitude, similarly to cycle 23 in 1989 and cycle 22 in 1979. The extended cycle is manifested by persistent Fe XIV coronal emission appearing near 70 degrees latitude and slowly migrating towards the equator, merging with the latitudes of sunspots and active regions the butterfly diagram after several years. Cycle 24 began its migration at a rate 40 slower than the previous two solar cycles, thus indicating the possibility of a peculiar cycle. However, the onset of the Rush to the Poles of polar crown prominences and their associated coronal emission which has been a precursor to solar maximum in recent cycles cf. Altrock 2003 has just been identified in the northern hemisphere. Peculiarly, this Rush is leisurely, at only 50 of the rate in the previous two cycles. The properties of the current Rush to the Poles yields an estimate of 2013 or 2014 for solar maximum.

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE