The table below shows the most common keywords used by the author. The letters in brackets after some keywords denote if the keyword corresponds to Solar Physics (S) or Heliospheric Physics (H).
| Keyword
| Occurrences
|
|---|
| Sunspots [S]
| 40
|
| Astrophysics - Solar And Stellar Astrophysics [S]
| 30
|
| Solar Cycle
| 28
|
| Solar Activity
| 19
|
| Sunspot Number
| 16
|
| Observations
| 15
|
| Statistics
| 15
|
| Sun: Activity
| 12
|
| Maunder Minimum
| 8
|
| Sun: General
| 6
|
| The Sun [S]
| 6
|
| Physics - History And Philosophy Of Physics
| 5
|
| Astronomical Data Bases: Miscellaneous
| 4
|
| Sunspot Cycle
| 4
|
| Sunspot Groups
| 4
|
| Astronomy Databases
| 3
|
| Machine Learning
| 3
|
| Historical Records
| 3
|
| Solar-terrestrial Relations
| 3
|
| Time Series Analysis
| 3
|
| Sun: Filaments [S]
| 3
|
| Solar-terrestrial Interactions
| 2
|
| Solar Radius
| 2
|
| History And Philosophy Of Astronomy
| 2
|
| Sunspot Area
| 2
|
| Solar Observations
| 2
|
| Fourier Transform
| 2
|
| Sun: Flares [S]
| 2
|
| Catalogs
| 2
|
| Physics - Space Physics [H]
| 2
|
| Fast Fourier Transform
| 1
|
| Extreme Events
| 1
|
| Earth
| 1
|
| Deep Learning
| 1
|
| Cortie Classification
| 1
|
| Automatic Detection
| 1
|
| Aurora
| 1
|
| Astronomical Databases: Miscellaneous
| 1
|
| Zürich Classification
| 1
|
| Umbra
| 1
|
| Sunspot-number Series
| 1
|
| Sunspot Observations
| 1
|
| Sunspot Catalogue
| 1
|
| Sunspot
| 1
|
| Sun: Sunspots
| 1
|
| Sun: Coronal Mass Ejections
| 1
|
| Structure
| 1
|
| Spectroheliograms
| 1
|
| Solar Storm
| 1
|
| Solar Phenomena
| 1
|
| Solar Hemisphere
| 1
|
| Solar Cycle 9
| 1
|
| Solar Cycle 8
| 1
|
| Solar Cycle 25
| 1
|
| Solar Activity Prediction
| 1
|
| Solar Activity Forecast
| 1
|
| Rotation
| 1
|
| Portugal
| 1
|
| Physics - Popular Physics
| 1
|
| Penumbrae
| 1
|
| Parma
| 1
|
| Neural Network
| 1
|
| Morphological Classification Of Sunspots
| 1
|
| Madrid Astronomical Observatory
| 1
|
| Historic Solar Observations
| 1
|
| Hemispheric Sunspot Number
| 1
|
| Group Sunspot Number
| 1
|
| Geomagnetic Fields
| 1
|
| Angelo Secchi
| 1
|
| Active Region
| 1
|