Sample Fluid Tau 1, G1 Minor Magnetic Storm

Journal notes, Sample Fluid Tau 1, G1 Minor Magnetic Storm

GELLER Labs "Backyard Science"

Thoughts on a proton precession magnetometer design - a Proton Magnetometer Project. Build an Earth's field magnetometer.

The FDM MAGNETOMETER1 project is a low cost high performance proton magnetometer (a digital magnetometer) kit under development for universities and amateur scientists to be able to accurately measure and monitor changes in the Earth's total magnetic F field and to observe geomagnetic storms. Magnetic storms can cause large excursions in the field and are of concern to interests ranging from electrical power grids, radio communications, and satellite operations, to aurora watchers and amateur radio operators.

1 Filter Diagonalization Method "FDM" (harmonic inversion), see Jan 21 and Jan 23 entries, based on: Vladimir A. Mandelshtam, Howard S. Taylor, Harmonic inversion of time signals and its applications, Journal of Chemical Physics (1997), Volume 107, Issue 17, 1997, Pages 6756-6769

(be sure to hit refresh to pick up our latest changes and entries)

Project Articles!

Project Documentation (very early stages)

Past Project Journal Notes

Journal Notes:

Saturday, December 25, 2010 - Direct measurement of Sample Fluid Tau 1 ! PDF

Overnight: PDF, TXT Sample spectra PDF, log spectra PDF. The geomagnetic field was relatively quiet overnight, with one minor slow impulse just before 4 am (0900 UTC). Moving the digitization software trigger forward 300 ms appears to be working fine. Here is the FDM amplitude PDF, and FDM figure of merit (FOM) PDF from the overnight period. Since the digitization trigger was moved back, the NBLNA gain turned down, and the few tens of microseconds current noise, at FET turn off, was attenuated with a small snubber capacitor (see December 21 journal entry), the measurement success rate was (535/702) or about 76%, the average FOM remains 5x10^-7 (~0.03nT).

In the past we made tau 1 and tau 2 measurements (NMR properties of the working fluid) using the hp 3581A wave analyzer and an oscilloscope. With the addition of the numeric peak envelope voltage display and data logging of the peak value, the FDM magnetometer can now be used to measure the tau 1 of a NMR fluid sample using no additional equipment! Tau 1 measurements web page for Prestone De-Icer Windshield Washer Fluid. Evening PDF

Sunday, December 26, 2010

Overnight: PDF, TXT, FDM Amplitude PDF, FDM FOM PDF, quiet overnight. The measurement success rate continues at about 76% and the average FOM at 5x10^-7 (~0.03nT). Evening: some noticable, but slight, increase in local geomagnetic activity PDF this late afternoon. Success rate is up to 78% this evening (outside air temperature -10c). PDF In months of past operation, we rarely saw success rates higher than 60 to 65%. It will be interesting to see in our work that follows if this is the nearly optimal design, or if there is significant improvement yet to be had.

Monday, December 27, 2010

Overnight: PDF, TXT , very quiet, later, a good view of the beginning of a normal diurnal cycle PDF. Spikes and offsets are caused by arriving and departing vehicles and garbage trucks, and buses. Here is a close up view at 1 nT/div of one of the recent quiet periods from 11:47 pm to 1:47 am PDF.

It would be good to define the load resistance of the cable and powered coil with temperature. Here is very rough first estimate PDF. We will fill in test data as we get warmer days and refine the theoretical model to match the measured values. About 60 feet of cable is outdoors, about 25 feet in a roughly heated basement, and about 15 feet in the indoor heated work space (temperatures in degrees F). Will make a copy in c later, temperture coefficient of copper is about 3.93x10^-3/c, 2.18x10^-3/F. The first measured temps are very rough, the sensor is on a wall of the building on the opposite side from where the sensor coils are. Also, there is some heat loss from the building, so it can read a little high.

Tuesday, December 28, 2010 - G1 Minor Magnetic Storm

Overnight: PDF, TXT , It was quiet overnight, however, there is some geomagnetic activity this morning, right in the middle our normal local diurnal down-turn of the geomagnetic field PDF, NOAA Costello PDF, SWN PDF. NOAA Space Weather has called a minor G1 Magnetic Storm. Here in upstate, NY, the change in the scalar F field was relatively minor at about 17 nT. There is, however, a well defined slow pulse structure seemingly indicative of some magnetic storms, a more detailed view PDF. There could be more to follow PDF. USGS PDF, NRCan Ottawa PDF. Activity continues past noon (local time) PDF.

1:24 PM 24 hour view PDF, compare to last weeks several day view PDF or this several day view from 12/14 PDF (both of which unfortunately include several vehicle offsets). At 2:33 pm (local NY, US time) PDF As viewed 160 miles to the North by NRCan Ottawa PDF. 4:40 pm local, looks like this event is winding down PDF, the Costello index performed exceptionally well for this storm! PDF. Overview PDF of today's G1 magnetic storm.

More thoughts on using additional sensors to remove vehicle related artifacts from the actual geomagnetic field measurement.

Wednesday, December 29, 2010

Overnight: PDF, TXT, return to quiet overnight.

Thursday, December 30, 2010

Overnight: PDF, TXT, return to quiet overnight. Interesting relatively fast positive going pulse this morning PDF.

Added a "Fast Cycle" button to the front panel to switch from the normal two minute measurement time to a 20 second fast measurement cycle to be better able to time resolve interesting events. PDF

Friday, December 31, 2010

Overnight: PDF, TXT, all is well (and geomagnetically quiet), overnight figure of merit PDF, amplitude PDF, sample Spectra (this morning) PDF, PDF2 Log Spectra PDF, PDF2 and the normal quiet diurnal cycle begins anew PDF.

Saturday, January 1, 2011

Overnight: PDF, TXT The geomagnetic field was very quiet overnight. figure of merit (FOM) PDF, amplitude PDF. Why is the measurement success rate now always about 77%? Observations on the measurement success rate.

Project Articles!

Project Documentation (very early stages)

Past Project Journal Notes

QUESTIONS/COMMENTS/notice of typos, etc. send email to joegeller at gellerlabs dot com

Geller Labs	Geller Labs
Manuals	Journal notes, Sample Fluid Tau 1, G1 Minor Magnetic Storm GELLER Labs "Backyard Science" Thoughts on a proton precession magnetometer design - a Proton Magnetometer Project. Build an Earth's field magnetometer. The FDM MAGNETOMETER1 project is a low cost high performance proton magnetometer (a digital magnetometer) kit under development for universities and amateur scientists to be able to accurately measure and monitor changes in the Earth's total magnetic F field and to observe geomagnetic storms. Magnetic storms can cause large excursions in the field and are of concern to interests ranging from electrical power grids, radio communications, and satellite operations, to aurora watchers and amateur radio operators. 1 Filter Diagonalization Method "FDM" (harmonic inversion), see Jan 21 and Jan 23 entries, based on: Vladimir A. Mandelshtam, Howard S. Taylor, Harmonic inversion of time signals and its applications, Journal of Chemical Physics (1997), Volume 107, Issue 17, 1997, Pages 6756-6769 (be sure to hit refresh to pick up our latest changes and entries) Project Articles! Project Documentation (very early stages) Past Project Journal Notes Journal Notes: Saturday, December 25, 2010 - Direct measurement of Sample Fluid Tau 1 ! PDF Overnight: PDF, TXT Sample spectra PDF, log spectra PDF. The geomagnetic field was relatively quiet overnight, with one minor slow impulse just before 4 am (0900 UTC). Moving the digitization software trigger forward 300 ms appears to be working fine. Here is the FDM amplitude PDF, and FDM figure of merit (FOM) PDF from the overnight period. Since the digitization trigger was moved back, the NBLNA gain turned down, and the few tens of microseconds current noise, at FET turn off, was attenuated with a small snubber capacitor (see December 21 journal entry), the measurement success rate was (535/702) or about 76%, the average FOM remains 5x10^-7 (~0.03nT). In the past we made tau 1 and tau 2 measurements (NMR properties of the working fluid) using the hp 3581A wave analyzer and an oscilloscope. With the addition of the numeric peak envelope voltage display and data logging of the peak value, the FDM magnetometer can now be used to measure the tau 1 of a NMR fluid sample using no additional equipment! Tau 1 measurements web page for Prestone De-Icer Windshield Washer Fluid. Evening PDF Sunday, December 26, 2010 Overnight: PDF, TXT, FDM Amplitude PDF, FDM FOM PDF, quiet overnight. The measurement success rate continues at about 76% and the average FOM at 5x10^-7 (~0.03nT). Evening: some noticable, but slight, increase in local geomagnetic activity PDF this late afternoon. Success rate is up to 78% this evening (outside air temperature -10c). PDF In months of past operation, we rarely saw success rates higher than 60 to 65%. It will be interesting to see in our work that follows if this is the nearly optimal design, or if there is significant improvement yet to be had. Monday, December 27, 2010 Overnight: PDF, TXT , very quiet, later, a good view of the beginning of a normal diurnal cycle PDF. Spikes and offsets are caused by arriving and departing vehicles and garbage trucks, and buses. Here is a close up view at 1 nT/div of one of the recent quiet periods from 11:47 pm to 1:47 am PDF. It would be good to define the load resistance of the cable and powered coil with temperature. Here is very rough first estimate PDF. We will fill in test data as we get warmer days and refine the theoretical model to match the measured values. About 60 feet of cable is outdoors, about 25 feet in a roughly heated basement, and about 15 feet in the indoor heated work space (temperatures in degrees F). Will make a copy in c later, temperture coefficient of copper is about 3.93x10^-3/c, 2.18x10^-3/F. The first measured temps are very rough, the sensor is on a wall of the building on the opposite side from where the sensor coils are. Also, there is some heat loss from the building, so it can read a little high. Tuesday, December 28, 2010 - G1 Minor Magnetic Storm Overnight: PDF, TXT , It was quiet overnight, however, there is some geomagnetic activity this morning, right in the middle our normal local diurnal down-turn of the geomagnetic field PDF, NOAA Costello PDF, SWN PDF. NOAA Space Weather has called a minor G1 Magnetic Storm. Here in upstate, NY, the change in the scalar F field was relatively minor at about 17 nT. There is, however, a well defined slow pulse structure seemingly indicative of some magnetic storms, a more detailed view PDF. There could be more to follow PDF. USGS PDF, NRCan Ottawa PDF. Activity continues past noon (local time) PDF. 1:24 PM 24 hour view PDF, compare to last weeks several day view PDF or this several day view from 12/14 PDF (both of which unfortunately include several vehicle offsets). At 2:33 pm (local NY, US time) PDF As viewed 160 miles to the North by NRCan Ottawa PDF. 4:40 pm local, looks like this event is winding down PDF, the Costello index performed exceptionally well for this storm! PDF. Overview PDF of today's G1 magnetic storm. More thoughts on using additional sensors to remove vehicle related artifacts from the actual geomagnetic field measurement. Wednesday, December 29, 2010 Overnight: PDF, TXT, return to quiet overnight. Thursday, December 30, 2010 Overnight: PDF, TXT, return to quiet overnight. Interesting relatively fast positive going pulse this morning PDF. Added a "Fast Cycle" button to the front panel to switch from the normal two minute measurement time to a 20 second fast measurement cycle to be better able to time resolve interesting events. PDF Friday, December 31, 2010 Overnight: PDF, TXT, all is well (and geomagnetically quiet), overnight figure of merit PDF, amplitude PDF, sample Spectra (this morning) PDF, PDF2 Log Spectra PDF, PDF2 and the normal quiet diurnal cycle begins anew PDF. Saturday, January 1, 2011 Overnight: PDF, TXT The geomagnetic field was very quiet overnight. figure of merit (FOM) PDF, amplitude PDF. Why is the measurement success rate now always about 77%? Observations on the measurement success rate. Project Articles! Project Documentation (very early stages) Past Project Journal Notes QUESTIONS/COMMENTS/notice of typos, etc. send email to joegeller at gellerlabs dot com COPYRIGHT © 2009, 2010 JOSEPH M. GELLER, All rights reserved.
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