March 31, 2001 geomagnetic storm

Data acquisition

by Volker Grassmann, DF5AI, May 23, 2005

reserved

Start page

data acquisition

storm history

operational results

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science cooperation

tools

Auroral activity

POES vs. QSOs

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objectives

locating Auroras

IMF

QSO distances

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Scientific background data

Storm history

SpaceweatherLogo

The storm history data originates from various internet resources which are all referenced in the storm history section. Very special material was obtained from the internet services spaceweather.com and Science@NASA, respectively, including the animated view of the sunspot 9393 as well as solar wind and IMF data, see the corresponding sections in this project documentation. Special thanks to Dr. Philips for granting the permission of using all relevant material in this study.

SpaceNASA

Auroral activity

POESdata

This project received special assistance from the POES team at NASA. The POES program provides actual estimates of the Auroral oval, i.e. images of the northern and southern hemisphere displaying the hemispheric input power extrapolated from measurements taken along the polar orbits of the NOAA satellites.

David S. Evans and Sue Greer have re-calculated all data from March 31, 2001 which represents a major support to this project. The 59 plots now provide a complete picture on the Auroral activity on the northern and southern hemisphere between 0039 and 2346 UTC. Thank you very much indeed for this brilliant material.

Amateur radio data

DX reports on Auroral backscatter

By using the benefits from various ham radio email reflectors and by using the Amateur Radio Propagation Studies web site, the author has addressed the world-wide community of VHF radio amateurs asking for observation reports from March 31, 2001. This initiative has been communicated even by print and internet ham magazines resulting in an impressive and unexpected high feedback between December 2002 and May 2003 (the acknowledgements section provides a complete list of all radio amateurs having contributed dx reports to this analysis).

Another important contribution comes from A. Kantola, i.e. the complete logbook of the OH9W/OH2AQ dx cluster which provides a wealth of information on the March 31, 2001 scenario. J. Kraft, editor of the Dubus magazine approached many VHF dxers which has increased the amount of dx reports even more. I am grateful to all fellow hams for supporting this project - it is the first time, as far as I can see, radio amateurs have organized the acquistion of VHF dx information on a world-wide basis.

Currently, the database comprises the following material (last update Jan. 08, 2003):

  • Total number of records: 3.788 QSO data
  • Estimated number of records available for analysis purposes: 2.197 QSOs
  • Geographical distribution (# of QSOs): Europe (1.937), North America (239), Australia (21)
  • March 31, 2001, coverage: 0010 - 2356 UT
  • Frequencies: 28 MHz, 50 MHz, 70 MHz, 144 MHz, 222 MHz, 432 MHz
Acquisition of ham radio data successfully completed
Spaghetti

Figure 1. Database quicklook displaying all Aurora QSOs from March 31, 2001. This spaghetti needs to be analysed QSO by QSO to identify the corresponding geographical positions and temporal variationof Aurora backscatter.
AuroraVK

Figure 2. This plot does not appear spectacular, but it is because Aurora backscatter communication is a rarity in Australia. Tony, VK3CAT, wrote: "took a bit of effort to get the word out and some stations on air." The yellow colours correspond to the POES data from March 31, 2001, 0727 UT.

Unknown grid locators: the Maidenhead grid locator of the following stations needs to be verified. Please contact the author if you can provide any information.

DL3WK (= DF3WK?)
F6DJG/P
F8DPR (= F1DPR?)
G7RRU (= G7RAU?)
G8BKF (= F6BKF?)
GI6IXD (= G6XDI?)
GM0GEI (= GW0GEI?)
MM0CDW (= GM0CDW?)
MM0MAW (= MM0AMW?)
N4GA
NM1W
NQ2O
ON1AMJ (= ON1ALJ?)
OZ8ZL (= OZ8ZS?)
VE3CVG
VK5RO
VK7KXA
YO2IA (= YO2IA?)

From: http://www.df5ai.net

Copyright (C) of Volker Grassmann. All rights reserved. The material, or parts thereof, may not be reproduced in any form without prior written permission of the author.