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[RTTY] Geomagnetic Storm still in Progress

To: SWL <swl@mailman.qth.net>,"SW - TheBasicsOfShortwave" <thebasicsofshortwave@yahoogroups.com>,SWARL <SWARL@yahoogroups.com>, SWBC <swbc@topica.com>,"SWL and Ham DX Club" <hamradioandshortwavedxclub@yahoogroups.com>,VHF <vhf@w6yx.stanford.edu>,"rtty@contesting.com" <rtty@contesting.com>,CQ_Contesting <CQ-Contest@contesting.com>
Subject: [RTTY] Geomagnetic Storm still in Progress
From: "NW7US, Tomas" <nw7us@hfradio.org>
Date: Tue, 27 Jul 2004 07:22:02 -0700
List-post: <mailto:rtty@contesting.com>

At the time of preparing this NW7US Propagation Bulletin, 1345 27 July 2004 UTC, we are still under a major geomagnetic storm. The Planetary K index is reading 8, as is the Bolder, Colorado K index. The planetary K index has been at 7 or higher for the last four reporting periods (each period is three hours in length), or, for the last twelve hours. The Interplanetary Magnetic Field (IMF) has been consistantly, and strongly, oriented southward, and the wind speed has been very high, caused by the passage of a very fast and powerful coronal hole mass ejection. Visual Aurora was reported as far south as Texas, and radio Aurora has been very active. DX clusters are showing radio AU as high as 222 MHz, not just in North America, but across Asia and Europe, as well.

The result of all of this long-duration geomagnetic storminess at such high levels is to wipe out HF communications. Most of the HF band is experiencing severe depression of normal Maximum Usable Frequencies. Depressions of as high as 35 percent are happening at this time.

At the same time, radio Aurora propagation opportunity continues on 28 MHz and higher, up into the UHF frequencies. If you are not on the radio, you will never know. Get active, today!

These conditions, caused by the passage of a very powerful and fast coronal mass ejection, should subside by 28 July 2004 UTC. However, conditions will continue to be rocky on 28 July and into 29 July.

I will update as conditions warrent.

73 de Tomas, NW7US (AARØJA/AAAØWA)

: Propagation Editor for CQ, CQ VHF, and Popular Communications :
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