# Presentation: 819287

## Cosmic Rays Long Term Record

- Cosmic ray database begins in 1951. They have an inverse solar cycle behavior.

- Earlier data exist.

- FY07 Cosmic Rays -- new

## Archives from Scott Forbush, early cosmic ray scientist

** **

- Migration of historical cosmic ray observations on photographic charts and published bi-hourly values to digital format

- FY07 Cosmic Rays -- new

**Archives from Scott Forbush, early cosmic ray scientist**

- Cosmic ray ionization chamber data available beginning in 1936

**Six worldwide stations monitoring system**

- Cheltenham (later replaced by Fredericksburg), Maryland; Christchurch, New Zealand; Godhavn, Greenland; Climax, Colorado; Huancayo, Peru; and Mexico City, Mexico for the time period 1936-1959

**Proposal:**

**Notes:**
Sun Rallies Its Forces  The Sun is once again producing X level solar flares, with an X4.8 flare on July 23 from NOAA Active Region 10,039 and an X3 event associated with a halo coronal mass ejection (CME) on July 15.from NOAA Active Region 10,030.  There were reports of "substantial" impacts for aircraft controllers communicating with various aircraft during these events, though much of this information is internally protected by private companies and also protected by Homeland Security risks in DOD operations.  The low latitude geomagnetic field has not been significantly disturbed, because the Earth’s magnetic field effectively deflected the solar explosions.  As we get closer to the September equinox period, the chances of a good geo-effective connection improve considerably, making us more vulnerable to local environmental impacts. 

## Cosmic Ray legacy data

- Digitize in 2 minute intervals
-  -- annual bundles of strip charts
- Each day is about 24 inches long by 2 inches wide – 1 hour/inch
- Dr. Ken McCracken will help with timing issues.

**CDMP Cosmic Ray Digitization Project**

- FY07 Cosmic Rays -- new

**Cosmic Ray legacy data**

- The ionization chamber adds up the ionization on a capacitor, i.e., it gives a time integral of the cosmic ray flux.

- Nine boxes of photographic charts

- Every hour the capacitor is shorted out- -that is the step you see every hour on the charts.

**Notes:**
Sun Rallies Its Forces  The Sun is once again producing X level solar flares, with an X4.8 flare on July 23 from NOAA Active Region 10,039 and an X3 event associated with a halo coronal mass ejection (CME) on July 15.from NOAA Active Region 10,030.  There were reports of "substantial" impacts for aircraft controllers communicating with various aircraft during these events, though much of this information is internally protected by private companies and also protected by Homeland Security risks in DOD operations.  The low latitude geomagnetic field has not been significantly disturbed, because the Earth’s magnetic field effectively deflected the solar explosions.  As we get closer to the September equinox period, the chances of a good geo-effective connection improve considerably, making us more vulnerable to local environmental impacts. 

## Cosmic Ray legacy data

- contain important information never made public
- highly relevant to modern day scientific studies
**Photographic charts:**
- 9 boxes of 114 station years data, thus 70 Mbytes of data total from 2 minute digitization.
- PDF scans would also be valuable before discarding data
**Bi-hourly data in books keyed in: ****(1140 station months, plus summary tables)**
- Huancayo 1936-68
- Cheltenham/Fredericksburg 1936-68
- Christchurch 1947-61
- Godhavn 1947-Jul 59
- Mexico Jul 1957-58

- FY07 Cosmic Rays -- new