Jack Harvey

NSO/T Scientific Staff


Areas of Interest

Solar Magnetic and Velocity Fields, Helioseismology, Instrumentation


Recent Research Results

Recent research by J. Harvey has focussed on the solar magnetic field as the driver of solar activity. Working with post-doctoral associate John Worden (funded by an ONR-grant), he studied the possibility that the intranetwork magnetic field component might be associated with ubiquitous tiny bright points that are observed a few hundred km above the photosphere. The clear result is that there is no association except for the largest and most persistent of the bright features. Harvey and Worden also completely overhauled the production of synoptic maps of the magnetic flux of the solar surface. The result is much better accuracy. In a related development, a new type of map was developed that shows a best estimate of the flux as a function of time everywhere on the solar surface with one-day time resolution. One immediate finding from this work was confirmation that small scale flux has to be replaced on the Sun every 2 - 3 days. They also found that a strong imbalance of the magnetic flux at the two solar poles has vanished in the last two years. This may well be related to an excess of coronal mass ejection activity in the southern hemisphere, but this notion needs to be studied in detail. Observations of the chromospheric magnetic field have revealed several new features that are not visible lower in the atmosphere. Perhaps the most intriguing new finding is a strong horizontal field found in close association with filament channels. Further study should help distinguish between the many theories of the formation of solar prominences.

Future Research Plans

During FY 2000 J. Harvey will concentrate on the SOLIS and GONG upgrade projects. Scientific research will continue on studies of the polar magnetic field, intranetwork magnetic fields, the chromospheric magnetic field, and the evolution of solar activity.

Service

J. Harvey performs observatory service as Chair of the NSO/KP TAC and NSO Scientific Personnel Committee, Instrument Scientist for the GONG project, Telescope Scientist for the KP Vacuum Telescope, and Project Scientist for the SOLIS project. He expects to continue with those responsibilities. In the outside community, he serves on NASA and NSF review panels and is a co-Editor of the journal Solar Physics. He is associated with the recently successful Lockheed-Martin proposal to provide a focal plane package for the Japanese Solar-B mission.


Updated: 28Jun1999